#include <bits/stdc++.h> using namespace std; double f(int x, int n) { if(n == 1) return 1.0 * x / (1 + x); return x / (n + f(x, n - 1)); } int main() { int x, n; cin >> x >> n; cout << fixed << setprecision(2) << f(x, n) << '\n'; return 0; }