#include <iostream>
#include <cmath>
using namespace std;
int main() {
    int a = 0,b = 0,c = 0,sum = 0,sum2 = 0;
    cin >> a;
    while(a != 0) {
        b = a % 10;
        a = a / 10;
        sum = b * pow(5,c);
        c = c + 1;
        sum2 = sum2 + sum;
    }
    cout << sum2;
    return 0;
}