#[rustfmt::skip]
pub mod lib {
    // pub use ac_library::*;
    // pub use itertools::{Combinations, Itertools, MultiProduct, Permutations};
    pub use proconio::{input,marker::{Chars, Usize1}};
    // pub use std::{cmp::*, collections::*, mem::swap};
    // pub use regex::Regex;
    // pub use superslice::Ext;
}

pub use lib::*;

fn main() {
    input! {
        n: usize,
        m: usize,
        sr: [(Chars, usize); n]
    }
    let mut ans = 0;
    for i in 0..n {
        if sr[i].1 < 1200 {
            continue;
        }
        for j in 0..4 {
            if sr[i].0[j] == 'x' {
                ans += 1usize;
                break;
            }
        }
    }

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