import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {
	int N;
	int[][] curMap;
	int[][] A;

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		double R = sc.nextDouble();
		double T = sc.nextDouble();
		double curR = 0;
		double curT = 1;
		for (int i = 0; i < N; ++i) {
			double nextR, nextT;
			nextR = curR + R * curT * curT * 1 / (1 - R * curR);
			nextT = curT * T * 1 / (1 - R * curR);
			curR = nextR;
			curT = nextT;
		}
		System.out.println(curR);
	}

	public static void main(String[] args) {
		new Main().run();
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}