#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main() {
	ll n; cin >> n;
	ll ans = 0;
	for (ll i = 1; i <= n; i++)
	{
		ll a, b, c; cin >> a >> b >>c ;
		
		ll d = 0;
		if (a == 1) d++;
		if (b == 1) d++;
		if (c == 1) d++;
		
		if (d >= 2) ans++;

	}
	cout << ans;
}