import java.util.Scanner;
public class GradeConverter {
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
int num, sum;
num = input.nextInt();
// Find the sum of all its divisors from 1 to num-1
for (int i = 1; i < num-1; i++)
{
if (num % i == 0)
{
sum += i;
}
}
if (sum == num)
{
System.out.println(num + " is a perfect number");
}
else
{
System.out.println(num + " is not a perfect number");
}
}
}
|