#include<cstdio>
#include<string>
#include<iostream>
#include<vector>
using namespace std;

string Di(string str,int x)
{
    int n=0;
    for(int i=0;i<str.size();i++)
    {
      int num= n*10+str[i]-'0';
        str[i]=num/x+'0';
        n=num % x;
    }
    int pos=0;
    while(str[pos]=='0')
    {
        pos++;
    }
    return str.substr(pos);
}

string Mu(string str,int x)
{
    int carry=0;
    for(int i=str.size()-1;i>=0;i--)
    {
        int current=x*(str[i]-'0')+carry;
        str[i]=current%10 +'0';
        carry=current/10;
    }
    if(carry!=0)
    {
        str="1"+str;
    }
    return str;
}


string ad(string str,int x)
{
    int carry=x;
    for(int i=str.size()-1;i>=0;i--)
    {
        int current=(str[i]-'0')+carry;
        str[i]=current%10+'0';
        carry=current/10;
    }
    if(carry!=0)
    {
        str="1"+str;
    }
    return str;
}


int main()
{
    string str;
    while(cin>>str){
    vector<int>l;
   while(str.size()!=0)
   {
       int x=str[str.size()-1]-'0';
       l.push_back(x%2);
       str=Di(str,2);
    }
        string an="0";
        for(int i=0;i<l.size();i++)
        {
            an=Mu(an,2);
            an=ad(an,l[i]);
        }
        cout<<an<<endl;
    }
    return 0;
}