#include<bits/stdc++.h>
#define ll unsigned long long
#define endl '\n'
#define tc() ll t;cin>>t;while(t--)
#define opt() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)

using namespace std;

ll decToBin(ll num) {
    ll bin = 0, count=0;
    while(num!=0) {
        ll r = num%2;
        ll t = pow(10, count);
        bin += r*t;
        num/=2;
        count++;
    }
    return bin;
}

ll rev(ll number) {
    ll rev = 0;
    while(number!=0) {
        rev = rev*10+(number%10);
        number/=10;
    }
    return rev;
}

ll binToDec(ll n) {
    ll Num = n;
    ll dec = 0;
    ll base = 1;
    ll temp = n;
    while(temp) {
        ll l = temp%10;
        temp/=10;
        dec += l*base;
        base*=2;
    }
    return dec;
}

int main() {
    opt();

    ll n;
    cin>>n;
    ll temp = decToBin(n);
    ll temp2 = rev(temp);
    ll ans = binToDec(temp2);

    cout<<ans<<endl;
}