#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,k;
    cin>>n>>k;
    double sumA=0;
    double numA=0;
    double sumB=0;
    double numB=0;
    for(int i=1;i<=n;i++)
    {
        if(i%k==0)
        {
            numA++;
            sumA+=i;
        }else
        {
            numB++;
            sumB+=i;
                 }
         cout << fixed << setprecision(1) << sumA / numA  << " " << sumB / numB << endl;
}
            return 0;
}