#include <iostream>
using namespace std;
int main() {
    long long s = 1;
    char ch = getchar();
    while (ch != '\n')
    {
        if (ch == '3')
            s *= 3;
        if (ch == '5')
            s *= 5;
        if (ch == '7')
            s *= 7;
        ch = getchar();
    }
    cout << (s == 1 ? 0 : s);
    return 0;
}