#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int n;
    cin>>n;
    ll ans = 0;
    ll d=1;
    while (n) {
        ans += n%7*d;
        d *= 10;
        n /= 7;
    }
    cout << ans << endl;
    return 0;
}