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