#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin >> n;

    int zadaci = 0;

    for (int i = 0; i < n; i++) {
        int petya, vasya, tonya;
        cin >> petya >> vasya >> tonya;
        if (petya + vasya + tonya >= 2) {
            zadaci++;
        }
    }

    cout << zadaci<< endl;

    return 0;
}