from sys import stdin

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

    if D * 100 >= 1000:
        print('Impossible')
        return

    cmb = [50] * B + [100] * A
    n, score = 0, 0
    for i, j in enumerate(cmb, start=1):
        score += j * (2 ** n)
        if not i % 100:
            n += 1

    print('Possible')
    print(score)

input = lambda: stdin.readline()
main()