import sys
A,B,C,D=map(int,input().split())
if D>=10:
    print("Impossible")
    sys.exit()
else:
    print("Possible")

score=0
combo=0

for i in range(B):
    
    score+=50*(2**(combo//100))
    combo+=1

for i in range(A):
    
    score+=100*(2**(combo//100))
    combo+=1

print(score)