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

int main(){
  int N,M,sum=0;cin>>N>>M;
  vector<string> S(N);
  vector<int> R(N);
  for(int i=0;i<N;i++){
    cin>>S.at(i)>>R.at(i);
    if(R.at(i)>=1200&(S.at(i).at(0)=='x'||S.at(i).at(1)=='x'||S.at(i).at(2)=='x'||S.at(i).at(3)=='x')) sum++;
  }
  cout<<sum<<endl;
}