Codeforces - 231A

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n , a , b , c , answer = 0;
    scanf("%d",&n);
    for (int i = 0 ; i < n ; i++ ){
        scanf("%d%d%d",&a,&b,&c);
        if (a + b + c >= 2){
            answer++;
        }
    }
    printf("%d",answer);
    return 0;
}