#include <iostream>

using namespace std;

int main()
{
   int n;
   cin >> n;
    int res = 0;

   for(int i = 1;i <= n; i++){
    int x;
    cin >> x;
    int ok = 0;
    for(int j = x;j > 0;j /= 10){
         int cifra = j%10;
         if (cifra == 1 or cifra == 4 or cifra == 7){
            ok += 1;
         }
    }
       if(ok == 4) {
           res++;
       }

    }
    cout << res << endl;
    return 0;
}