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