231A-Team

#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
using namespace std;

int main() {
    int n,n1,n2,n3,ans=0;
    cin>>n;
    while(n--){
        cin>>n1>>n2>>n3;
        if ((n1+n2+n3)>1)
            ans++;
    }
    cout<<ans<<endl;
    return 0;
}