#include<bits/stdc++.h>
using namespace std;

signed main() {
    int n, k, A = 0, B = 0, cA = 0, cB = 0;
    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        if (i % k) B += i, cB++;
        else A += i, cA++;
    }
    printf("%.1f %.1f", 1.0 * A / cA, 1.0 * B / cB);
    return 0;
}