#include<bits/stdc++.h>
#include <cstdio>
using namespace std;
int main(){
int n,k,asum=0,anum=0,bsum=0,bnum=0;
cin>>n>>k;
for(int i=1;i<=n;i++){
if(i%k==0){
asum+=i;
anum+=1;
}else{
bsum+=i;
bnum+=1;
}
}
double aavg=double(asum)/double(anum);
double bavg=double(bsum)/double(bnum);
printf("%.1f",aavg);
cout<<" ";
printf("%.1f",bavg);
return 0;
}
