import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int sum=0;
        for(int i=0;i*i<=Math.sqrt(n);i++){
            if(val%i==0){
                sum=sum+i;
                if(i!=n/i){
                    sum=sum+(n/i);
                }
            }
        }
        if(sum==n) System.out.println("perfect number");
        else System.out.println("Not a perfect number");
        
    }
}