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