func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var d: int :: cui@inputInt()

	if(d = 10)
		do cui@print("Impossible\n")
		ret
	end if
	var rate: int :: 1
	var combo: int :: 0
	var ans: int
	for i(1, b + a)
		do combo :+ 1
		if(combo > 100 & combo % 100 = 1)
			do rate :* 2
		end if
		do ans :+ (i <= b ?(50, 100)) * rate
	end for
	do cui@print("Possible\n")
	do cui@print("\{ans}\n")
end func