#include <iomanip>
#include <iostream>
#include <vector>
 
using namespace std;
 
int main() {
    int i, j, n, d;
    cin >> n >> d;
    double prob = 1. / d;
    vector<double> a(n);
    a[0] = 1.;
    for (i = 0; i < n; i++)
        if (a[i] > .0) {
            double next = a[i] * prob;
            for (j = 1; j <= d && i + j < n; j++)
                a[i + j] += next;
        }
    cout << setprecision(9) << fixed;
    for (i = 0; i < n; i++)
        cout << i + 1 << ": " << a[i] << '\n';
}
 

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