b2eDcj - Online C++ Compiler & Debugging Tool

#include <bits/stdc++.h>
using namespace std;

int main()
{
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);

     int n, flag = 0;
        cin >> n;


            if(n>0&&(n&n-1)==0)
            flag=1;

        if (flag)
            cout << "YES" << endl;
        else
            cout << "NO" << endl;

    return 0;
}