#include<stdio.h>
#include<math.h>
int main()
{
int i,x,s,n;
double y;
while(scanf("%d",&n)==1 && n)
{
x=1;
while(x<=n)
{
x*=2;
}
s=x%n;
printf("%d\n",n-s);
}
return 0;
}
#include<math.h>
int main()
{
int i,x,s,n;
double y;
while(scanf("%d",&n)==1 && n)
{
x=1;
while(x<=n)
{
x*=2;
}
s=x%n;
printf("%d\n",n-s);
}
return 0;
}
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