C++解答

#include <iostream>

using namespace std;

int fn(int n)
{
	int a=0;
	for (int i = 1; i <= n; i++)
	{
		if(n%i==0)
			a+=i;
	}
	return a;
}
int main()
{
	int c;
	cin>>c;
	cout<<fn(c)<<endl;
	return 0;
}