#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	double a, b;
	cin >> a >> b;
	if (a == 1) cout << b << endl;
	else if (b == 0) cout << 0 << endl;
	else cout << -b / (a - 1) << endl;
	return 0;
}