#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    int count = 0;
    for (int i = 0; i < n; i++) {
        int num;
        cin >> num;
        int a = num % 10;
        int b = (num / 10) % 10;
        int c = (num / 100) % 10;
        int d = num / 1000;
        if (a - d - b - c > 0) {
            count++;
        }
    }
    cout << count << endl;
    return 0;
}

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