#include<bits/stdc++.h> using namespace std; int main(){ int n,z,gd = 0; cin >> n; for(int i = 1; i <= n; i++){ cin >>z; int g = n%10; int s = n/10%10; int b = n/100%10; int q = n/1000%10; if(g-s-b-q >0){ gd++; } cout << gd; } return 0; }