def main():
    p,gr,go,m = map(int,input().split())
    if m == 10:
        return print('Impossible')
    score = 0
    comb =0
    bns =1
    while gr//100 >=1:
        score += 100*50*bns
        gr -=100
        comb +=100
        bns = 2**(comb//100)
    while gr>0:
        score += 50*bns
        gr -=1
        comb +=1
        bns = 2**(comb//100)
    while p >0:
        score += 100*bns
        p -=1
        comb +=1
        bns = 2**(comb//100)
    print('Possible\n' + str(score))
main()