import sys


def main():
    a, b, c, d = map(int, input().split())

    if d >= 10:
        print('Impossible')
        return
    
    print('Possible')

    ans = 0
    comb = 1

    for i in range(b):
        ans += 50 * 2**((comb - 1) // 100)
        comb += 1
    
    for i in range(a):
        ans += 100 * 2**((comb - 1) // 100)
        comb += 1
    
    print(ans)


if __name__ == '__main__':
    main()