usaco-practice/codeforces/Team/index.cpp

using namespace std;

#include <iostream>

int main() {
  int n;
  int c = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int k = 0;
    for (int j = 0; j < 3; j++) {
      int l;
      cin >> l;
      k += l;
    }
    if (k >= 2) {
      c += 1;
    }
  }
  cout << c << endl;
}