func main()
	var _: [][]char :: cui@input().split(" ")
	var A: int :: _[0].toInt(&)
	var B: int :: _[1].toInt(&)
	var C: int :: _[2].toInt(&)
	var D: int :: _[3].toInt(&)
	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