diff --git a/src/RomanNumerals.java b/src/RomanNumerals.java
index 20904f0..8c7a97e 100644
--- a/src/RomanNumerals.java
+++ b/src/RomanNumerals.java
@@ -1,8 +1,234 @@
 
 public class RomanNumerals {
-	public int convertToInteger(String romanNum) {
+
+	public static int convertToInteger(String romanNum) {
 		// To be Implemented
+		if(romanNum == "I") return 1;
+
+		else
+
+			if(romanNum == "V") return 5;
+
+			else
+
+				if(romanNum == "X") return 10;
+
+				else
+
+					if(romanNum == "L") return 50;
+
+					else
+
+						if(romanNum == "C") return 100;
+
+						else
+
+							if(romanNum == "D") return 500;
+
+							else
+
+								if(romanNum == "M") return 1000;
 		return 0;
+	}
+	//The symbols'I''X''C'and'M'can be repeated at most 3 times in a row.
+	public static boolean repeatLessThanThreeTimesI(String numI) {
+
+		// TODO Auto-generated method stub
+		int repeat=0;
+		for (int i = 0; i < numI.length(); i++) {
+			if (numI.charAt(i)=='I') {
+				repeat++;
+			}
+		}
+
+		if (repeat<4) {
+			return true;
+		}else{
+			return false;
+		}
+
+	}
+
+	public static boolean repeatLessThanThreeTimesX(String numX) {
+
+		// TODO Auto-generated method stub
+		int repeat=0;
+		for (int i = 0; i < numX.length(); i++) {
+			if (numX.charAt(i)=='I') {
+				repeat++;
+			}
+		}
+
+		if (repeat<4) {
+			return true;
+		}else{
+			return false;
+		}
+
+	}
+	public static boolean repeatLessThanThreeTimesC(String numC) {
+
+		// TODO Auto-generated method stub
+		int repeat=0;
+		for (int i = 0; i < numC.length(); i++) {
+			if (numC.charAt(i)=='I') {
+				repeat++;
+			}
+		}
+
+
+		if (repeat<4) {
+			return true;
+		}else{
+			return false;
+		}
+
+	}
+	public static boolean repeatLessThanThreeTimesM(String numM) {
+
+		// TODO Auto-generated method stub
+		int repeat=0;
+		for (int i = 0; i < numM.length(); i++) {
+			if (numM.charAt(i)=='I') {
+				repeat++;
+			}
+		}
+
+		if (repeat<4) {
+			return true;
+		}else{
+			return false;
+		}
+
+	}
+
+	public static boolean neverRepeatV(String numV){
+
+		int repeat = 0;
+
+		for (int i = 0; i < numV.length(); i++) {
+			if(numV.charAt(i) == 'V'){
+				repeat ++;
+			}
+		}
+		if(repeat == 1){
+			return true;
+		}else{
+			return false;
+		}
+	}
+
+	public static boolean neverRepeatL(String numL){
+
+		int repeat = 0;
+
+		for (int i = 0; i < numL.length(); i++) {
+			if(numL.charAt(i) == 'L'){
+				repeat ++;
+			}
+		}
+		if(repeat == 1){
+			return true;
+		}else{
+			return false;
+		}
+	}
+
+	public static boolean neverRepeatD(String numD){
+
+		int repeat = 0;
+
+		for (int i = 0; i < numD.length(); i++) {
+			if(numD.charAt(i) == 'D'){
+				repeat ++;
+			}
+		}
+		if(repeat == 1 || repeat == 0){
+			return true;
+		}else{
+			return false;
+		}
+	}
+
+	
+	public static String substracted(String oneSymbol){
 		
+		char J = 3;
+		char K = 8;
+		char R = 80;
+		char Z = 30;
+		char W = 300;
+		char Y = 800;
+		int repeat = 0;
+
+		for (int i = 0; i < oneSymbol.length(); i++) {
+
+			if(oneSymbol.charAt(i) == 'I'){
+				repeat ++;
+			}else{
+
+				if(repeat == 1 && ( (oneSymbol.charAt(i) == 'V') || (oneSymbol.charAt(i) == 'X'))){
+				
+					if((oneSymbol.charAt(i) == 'V')){
+						
+						char[] l = oneSymbol.toCharArray();
+						l[i] = J;
+						oneSymbol = l.toString();
+						
+					}
+				}else if(oneSymbol.charAt(i) == 'X'){
+
+					char[] l = oneSymbol.toCharArray();
+					l[i] = K;
+					oneSymbol = l.toString();
+					
+				}
+			}
+			
+			if(oneSymbol.charAt(i) == 'X'){
+				repeat ++;
+			}else{
+
+				if(repeat == 1 && ( (oneSymbol.charAt(i) == 'C') || (oneSymbol.charAt(i) == 'L'))){
+				
+					if((oneSymbol.charAt(i) == 'C')){
+						
+						char[] l = oneSymbol.toCharArray();
+						l[i] = R;
+						oneSymbol = l.toString();
+						
+					}
+				}else if(oneSymbol.charAt(i) == 'L'){
+
+					char[] l = oneSymbol.toCharArray();
+					l[i] = Z;
+					oneSymbol = l.toString();
+					
+				}
+			}
+			
+			if(oneSymbol.charAt(i) == 'C'){
+				repeat ++;
+			}else{
+
+				if(repeat == 1 && ( (oneSymbol.charAt(i) == 'D') || (oneSymbol.charAt(i) == 'M'))){
+				
+					if((oneSymbol.charAt(i) == 'D')){
+						
+						char[] l = oneSymbol.toCharArray();
+						l[i] = W;
+						oneSymbol = l.toString();
+						
+					}
+				}else if(oneSymbol.charAt(i) == 'M'){
+
+					char[] l = oneSymbol.toCharArray();
+					l[i] = Y;
+					oneSymbol = l.toString();
+					
+				}
+			}		
+		}
+	return oneSymbol;
 	}
 }
diff --git a/tests/TestRomanNumerals.java b/tests/TestRomanNumerals.java
index 5d1de75..92e0289 100644
--- a/tests/TestRomanNumerals.java
+++ b/tests/TestRomanNumerals.java
@@ -5,8 +5,95 @@
 public class TestRomanNumerals {
 
 	@Test
-	public void test() {
-		fail("Not yet implemented");
+	public void test_I_1() {
+		int romanNum = RomanNumerals.convertToInteger("I");
+		assertEquals(1, romanNum);
+
+	}
+
+	@Test
+	public void test_V_5() {
+		int romanNum = RomanNumerals.convertToInteger("V");
+		assertEquals(5, romanNum);
+
+	}
+
+	@Test
+	public void test_X_10() {
+		int romanNum = RomanNumerals.convertToInteger("X");
+		assertEquals(10, romanNum);
+
+	}
+
+	@Test
+	public void test_L_50() {
+		int romanNum = RomanNumerals.convertToInteger("L");
+		assertEquals(50, romanNum);
+
+	}
+
+	@Test
+	public void test_C_100() {
+		int romanNum = RomanNumerals.convertToInteger("C");
+		assertEquals(100, romanNum);
+
+	}
+	@Test
+	public void test_D_500() {
+		int romanNum = RomanNumerals.convertToInteger("D");
+		assertEquals(500, romanNum);
+
 	}
 
+	@Test
+	public void test_M_1000() {
+		int romanNum = RomanNumerals.convertToInteger("M");
+		assertEquals(1000, romanNum);
+
+	}
+
+	@Test
+	public void test_RepeatLessThanThreeTimesI(){
+		String numI = ("XIII");
+		assertTrue(RomanNumerals.repeatLessThanThreeTimesI(numI));
+	}
+	@Test
+	public void test_RepeatLessThanThreeTimesX(){
+		String numX = ("XX");
+		assertTrue(RomanNumerals.repeatLessThanThreeTimesX(numX));
+	}
+	@Test
+	public void test_RepeatLessThanThreeTimesC(){
+		String numC = ("C");
+		assertTrue(RomanNumerals.repeatLessThanThreeTimesC(numC));
+	}
+	@Test
+	public void test_RepeatLessThanThreeTimesM(){
+		String numM = ("M");
+		assertTrue(RomanNumerals.repeatLessThanThreeTimesM(numM));
+	}
+	
+	@Test
+	public void test_neverRepeatV(){
+		String numV = ("V");
+		assertTrue(RomanNumerals.neverRepeatV(numV));
+	}
+	
+	@Test
+	public void test_neverRepeatL(){
+		String numL = ("L");
+		assertTrue(RomanNumerals.neverRepeatL(numL));
+	}
+	
+	@Test
+	public void test_neverRepeatD(){
+		String numD = ("D");
+		assertTrue(RomanNumerals.neverRepeatD(numD));
+	}
+	
+	@Test
+	public void test_substracted(){
+		String oneSymbol = ("CD");
+		assertEquals("CW", oneSymbol);
+	}
 }