use std::io;

fn input_num() -> Vec<u64> {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    let mut v = Vec::new();
    for i in s.split_whitespace() {
        v.push(i.parse().unwrap());
    }
    v
}

fn input_str() -> String {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    s
}

fn main() {
    let v = input_num();

    let mut count = 0;
    let mut s;

    for _i in 0..v[0] {
        s = input_str();
        for c in s.chars() {
            if c == 'W' {
                count += 1;
            }
        }
    }
    println!("{}", count);
}