#include <stdio.h>

int main()
{
    int i, num, sum = 0;
    scanf("%d", &num);
    for(i=1; i<num; i++)
    {

        if(num%i == 0)
        {
            sum += i;
        }
    }

    if(sum == num)
    {
        printf("%d is PERFECT NUMBER", num);
    }
    else
    {
        printf("%d is NOT PERFECT NUMBER", num);
    }

    return 0;
}