N children standing in circle who are numbered 1 through N clockwise are waiting their candies. Their teacher distributes the candies by in the following way:

First the teacher gives child No.1 and No.2 a candy each. Then he walks clockwise along the circle, skipping one child (child No.3) and giving the next one (child No.4) a candy. And then he goes on his walk, skipping two children (child No.5 and No.6) and giving the next one (child No.7) a candy. And so on.

Now you have to tell the teacher whether all the children will get at least one candy?

The input consists of several data sets, each containing a positive integer N (2 ≤ N ≤ 1,000,000,000).

For each data set the output should be either "YES" or "NO".

#include<iostream>#include<stdio.h>#include<string.h>using namespace std;int main(){    long long n;    while(~scanf("%lld",&n))    {       while(n)       {           if(n&1) break;//二进制数最右位为1时，若n为1，则为2的指数，否则不能除2了也要退出           n>>=1;//相当于每次除2       }       if(n==1) printf("YES\n");       else printf("NO\n");    }    return 0;}