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