package test;
import java.util.Scanner;
public class test {
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		System.out.println("enter a number :");
		int n=scanner.nextInt();
		int sum=0;
		for(int i=1;i<n;i++)
			if(n%i==0)
				sum+=i;
		if(sum==n)
			System.out.println("是完全数");
		else
			System.out.println("不是完全数");
		
	}

}