#include <iostream>
using namespace std;

int main(){
    int n;
    cin >> n;


    int s = 0 , d;
    for(d=1 ; d * d < n ; ++ d)
        if(n % d == 0)
            s += d + n / d;
    if(d * d == n)
        s += d;

    if(2 * n == s)
        cout << n <<  " este perfect" << endl;
    else
        cout << n <<  " nu este perfect" << endl;
    return 0;
}