#include <bits/stdc++.h>
using namespace std;
int main(){
    long long n,k,cnt1 = 0,cnt2 = 0;
    double sum1 = 0,sum2 = 0,avg1,avg2;
    cin >> n;
    cin >> k;
    for (int i = 1;i <= n;i++){
        if (i % k == 0){
            sum1 += i;
            cnt1++;
        }else{
            sum2 += i;
            cnt2++;
        }
    }
    avg1 = sum1 / cnt1;
    avg2 = sum2 / cnt2;
    cout << fixed << setprecision(1) << avg1;
    cout << fixed << setprecision(1) << avg2;
    return 0;
}