#include<bits/stdc++.h> using namespace std; int main(){ int n; int g,sh,b,k; int m; int cc=0; cin>>m; for(int i=1;i<=m;i++){ cin>>n; g=n%10; sh=n%100/10; b=n%1000/100; k=n%10000/1000; if(g-sh-b-k>0){ cc++; } } cout<<cc; return 0; }