#include <iostream>
using namespace std;
int n, cnt;
char c[4];
int main()
{
	cin >> n;
	while(n --)
	{
		cin >> c;
		if(c[3] - c[2] - c[1] - c[0] > -96)
			cnt ++;
	}
	cout << cnt << endl;
	return 0;
}