文件目录

#include <iostream>
using namespace std;

int main()
{
    int n, num;
    cin >> n;
    int c = 0;
    while (n--)
    {
        cin >> num;
        int g = num % 10;
        int s = num % 100 / 10;
        int b = num % 1000 / 100;
        int q = num / 1000;
        if (g - s - b - q > 0)
            c++;
    }
    cout << c;
    return 0;
}