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

judges = [A,B]
m = 1
s = 50
combo = 0
ans = 0
while judges:
    for n in range(judges[-1]):
        if combo >= 100 and combo%100==0:
            m *= 2
        ans += m*s
        combo += 1
    s += 50
    judges.pop()
print(ans)