#include<bits/stdc++.h> using namespace std; int main() { int n; cin >> n; int c = 0; for (int i = 1; i <= n; i++) { int x; cin >> x; int ge = x % 10; int shi = x / 10 % 10; int bai = x / 100 % 10; int qian = x / 1000; if (ge - shi - bai - qian > 0) { c=c+1; } } cout<<c; return 0; }