#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 = z%10; int s = z/10%10; int b = z/100%10; int q = z/1000%100; if(g-s-b-q >0){ gd++ } cout << gd; } return 0; }