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