require 'bigdecimal'
n=gets.to_i
sr=gets.chomp

h=BigDecimal("100.0",300)
one=BigDecimal("1.0",300)
r = BigDecimal(sr,300)
r2=one
n.times{
	r2=(r2*(one-r)).round(300)
}
puts (h*(one-r2)/r).to_s("F")