#include using namespace std; #ifdef LOCAL_ void debug_out() {cerr << endl;} template void debug_out(Head H,Tail... T){cerr << ' ' << H; debug_out(T...);} #define debug(...) cerr << 'L' << __LINE__ << " [" << #__VA_ARGS__ << "]:",debug_out(__VA_ARGS__) #define dump(x) cerr << 'L' << __LINE__ << " " << #x << " = " << (x) << endl; #else #define debug(...) (void(0)) #define dump(x) (void(0)) #endif #define rep(i,n) for (int i = 0; i < (int)(n); i ++) #define irep(i,n) for (int i = (int)(n) - 1;i >= 0;--i) using ll = long long; using PL = pair; using P = pair; constexpr int INF = 1000000000; constexpr long long HINF = 100000'00000'00000; constexpr long long MOD = 1000000007;// = 998244353; constexpr double EPS = 1e-4; constexpr double PI = 3.14159265358979; #pragma region Macros template ostream &operator<<(ostream &os,const pair &p) { os << '(' << p.first << ',' << p.second << ')'; return os; } template ostream &operator<<(ostream &os,const vector &v) { os << '['; for (auto &e:v) {os << e << ',';} os << ']'; return os; } // grid searh const int dy[8] = {-1,0,1,0,-1,-1,1,1}; const int dx[8] = {0,1,0,-1,-1,1,-1,1}; bool IN(int y,int x,int H,int W) {return (0 <= y)&&(y < H)&&(0 <= x)&&(x < W);} //integer template T gcd(T a,T b) {return (b ? gcd(b,a%b): a);} #pragma endregion int main() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); ll p,q; cin >> p >> q; double prob = 1 - (double)1/p; double ans1 = 0; double ans2 = q; double power = 1; for (int i = 1;i <= 1000000;++i) { ans1 += power*i; power *= prob; } ans1 *= prob; if (ans1 < ans2) cout << ans1 << '\n'; else cout << ans2 << '\n'; return 0; }