#include <iostream>
using namespace std;
int main() {
     int n,rem;
	cin>>n;

    //for(int i=n;i>0;i=i/2)
    while(n>1)
	{
         if(n%2==1)
         { 
             cout<<"not the power of 2"<<endl;
             break;
         }   
           n=n/2;   
	}
    if(n==1)
    {
	    cout<<"power of 2"<<endl;
    }
    return 0;
}