N, M = map(int, input().split())
plan = [None] * (N + 1)
a = [[None] * M for t in range(N)]
for l in range(N):
    plan[l] = list(map(int, input().split()))

for k in range(N):
    if plan[k][1] != 0 and a[k - 1][1] != 0:
        a[k][1] = 1
    else: a[k][1] = 0
for t in range(M):
    if plan[1][t] != 0 and a[1][t - 1] != 0:
        a[1][t] = 1
    else: a[1][t] = 0

for i in range(2, N):
    for j in range(2, M):
        if plan[i][j - 1] != 0 and plan[i - 1][j] != 0:
            a[i][j] = a[i][j - 1] + a[i - 1][j]
        elif plan[i][j - 1] == 0 and plan[i -1][j] != 0:
            a[i][j] = a[i - 1][j]
        elif plan[i][j - 1] != 0 and plan[i -1][j] == 0:
            a[i][j] = a[i][j - 1]
        elif plan[i][j - 1] == 0 and plan[i -1][j] == 0:
            a[i][j] = 0
if a[N - 1][M - 1] != 0:
    print(a[N - 1][M - 1])
else: print('Impossible')