#include<bits/stdc++.h>
using namespace std;
int main(){
	long a,b,c,d,e,f,x;
	cin >> a;
	for(int i=0;i<a;i++){
        cin >> b;
        c = b / 1000;
        d = (b - c*1000) / 100;
        e = (b - c*1000 - d*100) / 10;
        f = b - c*1000 - d*100 - e*10;
	    if(f-c-d-e > 0){
	    	x += 1;
		}
	}
	cout << x << endl;
	return 0;
}