#include<bits/stdc++.h> using namespace std; int main(){ int n,a,ge,shi,bai,qian,sum=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a; ge=a%10; shi=a/10%10; bai=a/100%10; qian=a/1000; if((ge-qian-bai-shi)>0) sum++; } cout<<sum; return 0; }