A,B,C,D=map(int,input().split())

if D>=10:
    print("Impossible")
    
SCORE=0
combo=0
for i in range(1000):
    if B>=100:
        SCORE+=(50*100)*(2**combo)
        B-=100
        combo+=1
    elif B<100:
        if (100-B)<=A:
            SCORE+=(50*B)*(2**combo)
            SCORE+=(100*(100-B))*(2**combo)
            A-=(100-B)
            B=0
            combo+=1
            #print(SCORE)
        else:
            SCORE+=(50*B)*(2**combo)
            SCORE+=(100*A)*(2**combo)
            #print(SCORE)
            break
print("Possible")
print(SCORE)