a,b,c,d=list(map(int,input().split()))
if d==10:
    print("Impossible")
else:
    print("Possible")
    hoge=[50 for i in range(b)]+[100 for i in range(a)]
    for i in range(len(hoge)):
        hoge[i]=hoge[i]*(pow(2,i//100))
    print(sum(hoge))