#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n, x;
    cin >> n;
    int ans = 0;
    for (int i = 1; i <= n; i++)
    {
        cin >> x;
        int a, b, c, d; // x 的个位、十位、百位、千位
        a = x % 10;
        b = x / 10 % 10;
        c = x / 100 % 10;
        d = x / 1000 % 10;
        if (a - d - c - b > 0)
            ans++;
    }
    cout << ans;
    return 0;
}