a,b,c,d=map(int,input().split())
if d>9: s="Impossible"
else:
	s,t=0,0
	for i in [1]*b: s+=50*2**(t//100); t+=1
	for j in [1]*a: s+=100*2**(t//100); t+=1
	print("Possible")
print(s)