#include <iostream>
using namespace std;
int main()
{
    int n, num, x=0, ge, shi, bai, qian;
    cin >> n;
    for (int i=0; i<n; i++){
        cin >> num;
        qian = num/1000;
        bai = num/100%10;
        shi = num/10%10;
        ge = num%10;
        if ((ge-qian-bai-shi)>0) x++;
    }
    cout << x << endl;
    return 0;
}