use proconio::input;

fn main() {
    input! {
        n: usize,
        m: usize,
        xs: [(String, usize); n]
    }

    let rest = xs
        .iter()
        .filter(|(s, r)| *r >= 1200 && s.chars().take(4).any(|c| c == 'x'))
        .collect::<Vec<_>>();

    println!("{}", rest.len());
}