#include <bits/stdc++.h>
using namespace std;
int n , a , g , s , b , ans;
int main()
{
    cin >> n;
    for ( int i = 1; i <= n; i++ )
    {
    	cin >> a;
    	b = a / 100;
    	s = a % 100 / 10;
    	g = a % 10;
    	if( b == s && b == g)
    	{
//    		break;
    		continue;
		}
    	
    	if ( b == s || b == g || s == g )
    	{
    		ans++;
		}
	}
	cout << ans;
	return 0;
}