#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;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CiNkZWZpbmUgbGwgbG9uZyBsb25nCgppbnQgbWFpbigpIHsKCWxsIG47IGNpbiA+PiBuOwoJbGwgYW5zID0gMDsKCWZvciAobGwgaSA9IDE7IGkgPD0gbjsgaSsrKQoJewoJCWxsIGEsIGIsIGM7IGNpbiA+PiBhID4+IGIgPj5jIDsKCQkKCQlsbCBkID0gMDsKCQlpZiAoYSA9PSAxKSBkKys7CgkJaWYgKGIgPT0gMSkgZCsrOwoJCWlmIChjID09IDEpIGQrKzsKCQkKCQlpZiAoZCA+PSAyKSBhbnMrKzsKCgl9Cgljb3V0IDw8IGFuczsKfQ==