import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = 18446744073709551615
inf = 4294967295
md = 10**9+7
# md = 998244353

a, b, c, d = LI()
if d >= 10:
    print("Impossible")
    exit()

coef = 1
cnt = 0
ans = 0
for _ in range(b):
    cnt += 1
    ans += 50*coef
    if cnt%100 == 0: coef *= 2

for _ in range(a):
    cnt += 1
    ans += 100*coef
    if cnt%100 == 0: coef *= 2

print("Possible")
print(ans)