import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        if(N>=200){
            System.out.println(1);
            return;
        }
        double P = sc.nextDouble();
        double ans = 1-P;
        while(--N>0){
            ans *= 1-P;
        }
        System.out.println(1-ans);
    }
}