package main

import . "fmt"

func main() {
	var n,p float64
	Scan(&n,&p)
	if n>199 {
		Println(1)
		return
	}
	q:=1-p
	s:=1.0
	for ;n>0;n-=1 {
		s*=q
	}
	Println(1-s)
}