#include<iostream> #include<cstdio> using namespace std; int main() { int n, m; int a, b, c, d, sum = 0; int i; cin >> n; for (i = 1; i <= n; i++) { cin >> m; a = m / 1000; b = m / 100 % 10; c = m / 10 % 10; d = m % 10; if (d - a - b - c > 0) sum++; } cout << sum << endl; return 0; }