include

using namespace std;

int main() {

int a, b, c = 0;
int w1, w2, w3, w4;
cin >> a;
for (; a > 0; a--) {
	cin >> b;
	w1 = b % 10;
	w2 = b / 10 % 10;
	w3 = b / 100 % 10;
	w4 = b / 1000 % 10;
	if (w1 - w2 - w3 - w4 > 0) {
		c++;
	}
}
cout << c;
return 0;

}