#include <bits/stdc++.h>
using namespace std;

int main()
{
    int N, M;
    cin >> N >> M;
    int ans = 0;
    for (int i = 0; i < N; i++)
    {
        string S;
        int R;
        cin >> S >> R;
        if (R >= 1200)
        {
            for (int j = 0; j < min(M, 4); j++)
            {
                if (S[j] == 'x')
                {
                    ans++;
                    break;
                }
            }
        }
    }
    cout << ans;
}