poj 3372 Candy Distribution

Candy Distribution

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 4814		Accepted: 2595

Description

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?

Input

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

Output

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

Sample Input

2
3 
4

Sample Output

YES
NO
YES

#include<iostream>
#include<algorithm>
using namespace std;
int f(int n)
{
    int i=1;
    while(1) {
        if(n==i) 
            return 1;
        if(n<i) 
            return 0;
        i*=2;
    }
}
int main()
{
    int n;
    while(cin>>n)
    {
        if(f(n)) 
            cout<<"YES"<<endl;
        else 
            cout<<"NO"<<endl;
    }
    return 0;
}