#include<stdio.h>
int main()
{
int x,n,s;
while(scanf("%d",&n)==1)
{
if(n==0)
break;
x=1;
while(x<=n)
{
x=x*2;
s=x%n;
}
printf("%d\n",n-s);
}
}
/*
1. By multiplying x with 2, we are actually tracking
the cards after throwing and moving at the bottom.
2. By s = x%n and Result = n – s, we are getting the
card position and card number.
*/
