use std::io;

fn main() {
    let mut s = String::new();
    io::stdin().read_line(&mut s).ok();

    let (mut x, mut y) = (0, 0);
    s.trim().chars().for_each(|c| match c {
        'N' => y += 1,
        'E' => x += 1,
        'W' => x -= 1,
        'S' => y -= 1,
        _ => unreachable!(),
    });

    let hypotenuse = f64::from(x).hypot(f64::from(y));

    println!("{}", hypotenuse);
}