#include <iostream>
#include <string>
#include <vector>
#include <cmath>

using namespace std;


int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int t;
    cin >> t;

    int n = 0;

    for(int tc = 1; tc <= t; ++tc){
        int a, b, c;
        cin >> a >> b >> c;

        if(a + b + c > 1){
            n++;
        }
    }

    cout << n;

    cout << flush;

    return 0;
}