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

int main(){
    int n,k,cnt1=0,cnt2=0,sum1=0,sum2=0;
    double ans1,ans2;
    cin>>n>>k;
    for (int i=1;i<=n;i++){
        if (i%k==0){
            cnt1++;
            sum1+=i;
        }
        else{
            cnt2++;
            sum2+=i;
        }
    }
    ans1=sum1/cnt1*1.00;
    ans2=sum2/cnt2*1.00;
    printf("%.1ld %.1ld",ans1,ans2);
    return 0;
}