#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    int result = 0;
    for(int i = 0; i < n; i++) {
        int number;
        cin >> number;


        int pretpostavka = 1;
        for(int j = number; j > 0; j /= 10) {
            int cifra = j % 10;

            if(cifra != 1 and cifra != 4 and cifra != 7) {
                pretpostavka = 0;
            }
        }

        if(pretpostavka == 1) {
            result++;
        }
    }

    cout << result << endl;
    return 0;
}