a,b,c,d = map(int,input().split())
if d >= 10:
    print("Impossible")
    exit()

print("Possible")
scr = 0
fb = True
cmb = 0
while b > 0:
    if b > 100:
        scr += 100*50*pow(2,(cmb//100))
        b -= 100
        cmb += 100
    else:
        scr += b*50*pow(2,(cmb//100))
        cmb += b
        b = 0

while a > 0:
    tmp = 100-(cmb%100)
    if a > tmp:
        scr += tmp*100*pow(2,(cmb//100))
        a -= tmp
        cmb += tmp
    else:
        scr += a*100*pow(2,(cmb//100))
        cmb += a
        a = 0

print(scr)