#include <iostream>

#include <cctype>

using namespace std;

​

int main(){

    int n,i,sum=0;

    cout << "Enter a number: ";

    cin >> n;

       for(int i=1;i<n;i++)

       {if(n%i==0){

       sum=sum+i;

​

       }

       }

​

        if(sum==n)

            cout << n << " is a perfect number\n";

        else

            cout << n << " is not a perfect number\n";

​

​

return 0;

}

​

​