A.rs

/// Scanner class
/// Copied from https://codeforces.com/contest/1168/submission/54903799
///
/// Usage:
/// ```
/// let mut scanner = Scanner::default();
/// let n = scan.next::<i32>();
/// ```
#[derive(Default)]
struct Scanner {
	buffer: Vec<String>
}
impl Scanner {
	fn next<T: std::str::FromStr>(&mut self) -> T {
		loop {
			if let Some(token) = self.buffer.pop() {
				return token.parse().ok().expect("Failed parsing input")
			}
			let mut input = String::new();
			std::io::stdin().read_line(&mut input).expect("Failed reading input");
			self.buffer = input.split_whitespace().rev().map(String::from).collect();
		}
	}
}

fn main() {
	let mut scanner = Scanner::default();

	let _ = scanner.next::<usize>();
	let s = scanner.next::<String>();

	let cnt_left = s.chars().filter(|c| *c == 'L').count();
	let cnt_right = s.chars().filter(|c| *c == 'R').count();
	println!("{}", cnt_left + cnt_right + 1);
}