#include <iostream>
using namespace std;

int main()
{
    long long n,ans = 0,base = 1;
    cin >> n;

    for(int i = 0; n > 0; i++){
        ans = ans + n % 7 * base;
        n /= 7;
        base *= 10;
    }

    cout << ans << endl;

    return 0;
}