1077

#include <iostream>
using namespace std;
int main() {	
	int m,a,c;
	int g,s,b,q;
	cin>>a;
	for(int i=0;i<a;i++){
		cin>>m;
		q=m/1000;
		b=(m-1000*q)/100;
		s=(m-1000*q-100*b)/10;
		g=m-1000*q-100*b-10*s;
		if(g-q-b-s>0){
			c++;
		}else{
			c=c;
		}
	}
	cout<<c;
	return 0;
}