soln

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
   int n,i,k,solve =0;
   cin>>n;
   for(i =0;i<n;i++)
   {
       int count = 0;
       for(int j = 0;j<3;j++)
       {
           cin>>k;
           if(k == 1) count++;
       }
       if(count>1)  solve++;
   }
   cout<<solve;
    return 0;
}