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#include <stdio.h>
#include<stdbool.h>

bool divisible(int n)
{
    while(n%2==0 && n>1)
    {
        n=n/2;
    }
    return (n==1)?1:0;
}

int main()
{
    
    //write a program to check if number is of power 2 or not
    //2 4  8 16 32 
    //2  10 12 
    printf("Hello World");
    int n;
    scanf("%d",&n);
    
    printf("The above number is %s power of 2\n", divisible(n) ? "a" : "not a");

    return 0;
}