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