include <bits/stdc++.h>

using namespace std; int main() {

int n, sum = 0;
cin >> n;
while (n) {
	int k = n % 10;
	int sum1 = 1;
	for (int i = 1; i <= k; i++) {
		sum1 *= i;
	}
	sum += sum1;
	n /= 10;
}
cout << sum;
return 0;

}