s = []
n, m = map(int, input().split())
for i in range(n+1-1):
    s.append(list(map(int, input().split())))
z = [0] * n
for i in range(n+1-1):
    z[i] = [0] * m
for i in range(n):
    for j in range(m):
        if s[i][j] == 1:
            if i - 1 >= 0 and j - 1 >= 0:
                z[i][j] = z[i][j - 1] + z[i - 1][j]

            elif   j - 1 >= 0 and i - 1 < 0:
                z[i][j] = z[i][j - 1]
            elif i - 1 < 0 and j - 1 < 0:
                z[i][j] = 1
            elif  j - 1 < 0 and i - 1 >= 0 :
                z[i][j] = z[i - 1][j]
po=1
if z[-1][-1] != 0:
    print(z[-1][-1])
elif z[-1][-1] == 0:
    print("Impossible")
else:
    print("Impossible")