Codeforces_231A

//Codeforces Round 231A
#include <iostream>
using namespace std;
int main()
{
    int n, p[1001], v[1001], t[1001], sum, answ=0;
    cin >> n;
    for(int i=0;i<n;i++)
    {
        cin >> p[i] >> v[i] >> t[i];
        sum=p[i]+v[i]+t[i];
        if(sum>=2){answ++;}
    }
    cout << answ;
    return 0;
}