#include<stdio.h>
main()
{
   int n,c=0,i;
   for(i=0;i<(sizeof(n)*8);i++)
      if(n&(1<<i))
        c++;
   if(c==1)
     printf("%d is powwer of 2",n);
   else
     printf("%d is not a power of 2",n);
}