#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	int n,k;
	int num1 = 0, num2 = 0, num3 = 0, num4 = 0;
	cin >> n >> k;
	for (int i = 1; i <= n; i++)
	{
		if (i % k == 0)
		{
			num1 += i;
			num3++;
		}
		else
		{
			num2 += i;
			num4++;
		}
	}
	cout << fixed << setprecision(1) << double (num1) / num3 << "\n" << double (num2) / num4;
	return 0;
}

样例过了