#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;

const long double EPS = (1e-16);
#define INF (1e9)
#define PI (acos(-1))
//const ll mod = 1000000007;
long double dp[1005];

int main() {
    cout.precision(10);
    cin.tie(0);
    ios::sync_with_stdio(false);
    long double p, q;
    int N;
    cin >> N >> p >> q;
    if(p + EPS >= 1.0) {
        cout << 1 << endl;
        return 0;
    }
    dp[1] = p;
    for(int i = 2; i <= N; i++) {
        dp[i] = p + q * dp[i - 1] * q / (1 - dp[i - 1] * p);
    }
    cout << dp[N] << endl;
    return 0;
}