#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,k,a=0,b=0,n1=0,n2=0;cin>>n>>k;
    for(int i=1;i<=n;i++){
        if(i%k==0) {a+=i;n1++;}
        else {b+=i;n2++;}
    }
    printf("%.1lf %.1lf",a*1.0/n1,b*1.0/n2);
    return 0;
}