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)