import sys
from typing import Generator, List, Tuple


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    a, b, c, d = map(int, input().split())
    if d == 10:
        yield 'Impossible'
        return
    x = 0
    for i in range(a + b):
        x += (50 if i < b else 100) * (2 ** (i // 100))
    yield 'Possible'
    yield x


if __name__ == '__main__':
    ret = main()


    def out(x):
        if isinstance(x, List) or isinstance(x, Tuple):
            print(*x)
        else:
            print(x)


    if ret is None:
        pass
    elif isinstance(ret, Generator):
        for val in ret:
            out(val)
    else:
        out(ret)