#include <stdio.h>
int main(){
    int num;
    scanf("%d", &num);
    int sum = 0;
   for(i = 1; i < num; i++){
       if(num % i ==0)
       sum = sum + i;
   }
   if (sum == num){
       printf("%d is a perfect number",num);
   }else{
        printf("%d is not a perfect number",num);
   }
    return 0;
}