https://codeforces.com/problemset/problem/231/A

#include<bits/stdc++.h>
using namespace std;
int ans;
int main(void)
{
	int t; cin>>t;
	while(t--)
	{
		int a,b,c; cin>>a>>b>>c;
		int sum=a+b+c;
		if(sum>=2) ans++;
	}
	cout<<ans;
}