#include <bits/stdc++.h>
using namespace std;
int main()
{
 long long n,k=0,kl=0,ch=0,nol=-1;
 cin>>n;
 vector <long long > a(30,0);
 vector <long long > d(30,0);
 for (int i=29;i>=0;i--){
    a[i]=(1<<i);
 }
 a[0]=1;

for (long long i=29;i>=0;i--){
        if ((1<<i)>n){}
        else {k=1;}
if (k==0){}
else{
    kl++;
d[i]=1;
ch=max(i,ch);
}
}


for (int i=ch+1;i>=0;i--){
    if (d[i]==0){nol=i;}
}
if (nol==-1){cout<<a[ch-1]+n-a[ch];}
else if (n%2==0){cout<<n+1;}
else {cout<<a[nol]+n-a[nol-1];}
}