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