Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

def f(x):
    if x == 1 or x == 0:
        return 1
    else:
        return f(x-1) + f(x-2)

def sol(a):
    for i in range(m - 1):
        if a[i+1] - a[i] == 1:
            print(0)
            return
    mod = 10 ** 9 + 7
    stairs = []
    now = 0
    for i in range(m):
        stairs.append(a[i] - 1 - now)
        now = a[i] + 1
    stairs.append(n - now)

    ans = 1
    for ele in stairs:
        ans *= f(ele)

    print(ans % mod)


sol(a)
    


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [-1]
for i in range(m):
    a.append(int(input()))
a.append(n+1)

mod = 10 ** 9 + 7
stairs = [0, 1]
for i in range(2, n+1):
    stairs.append((stairs[i-1] + stairs[i-2]) % mod)

count = 1
for i in range(m+1):
    diff = a[i+1] - a[i] - 1
    count *= stairs[diff]
print(count % mod)


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [-1]
for i in range(m):
    a.append(int(input()))
a.append(n+1)

stairs = [0, 1]
for i in range(2, n+1):
    stairs.append(stairs[i-1] + stairs[i-2])

mod = 10 ** 9 + 7
count = 1
for i in range(m+1):
    diff = a[i+1] - a[i] - 1
    count *= stairs[diff]
print(count % mod)


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [-1]
for i in range(m):
    a.append(int(input()))
a.append(n+1)

stairs = [0, 1, 1]
for i in range(3, n+1):
    stairs.append(stairs[i-1] + stairs[i-2])

mod = 10 ** 9 + 7
count = 1
for i in range(m+1):
    diff = a[i+1] - a[i] - 1
    count *= stairs[diff]
print(count % mod)


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [-1]
for i in range(m):
    a.append(int(input()))
a.append(n+1)

stairs = [0, 1, 1]
for i in range(3, n+1):
    stairs.append(stairs[i-1] + stairs[i-2])

def ans():
    mod = 10 ** 9 + 7
    count = 1
    for i in range(m+1):
        diff = a[i+1] - a[i] - 1
        if diff == 0:
            print("0")
            return
        else:
            count *= stairs[diff]
    print(count % mod)
    return

ans()


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
a = [-1]
for i in range(m):
    a.append(int(input()))
a.append(n+1)

def f(stairs):
    if stairs == 1 or stairs == 2:
        return 1
    else:
        return f(stairs-1) + f(stairs-2)

def ans():
    mod = 10 ** 9 + 7
    count = 1
    for i in range(m+1):
        diff = a[i+1] - a[i] - 1
        if diff == 0:
            print("0")
            return
        else:
            count *= f(diff)
    print(count % mod)
    return

ans()


Fixed submission:
n, m = map(int, input().split())
a = [int(input()) for _ in range(m)]

ways = [1, 1]
for i in range(2, n + 1):
    ways.append(ways[i-2] + ways[i-1])

stairs = []
now = 0
for i in range(m):
    stairs.append(a[i] - 1 - now)
    now = a[i] + 1

stairs.append(n - now)

ans = 1
for ele in stairs:
    if ele == -1:
        ans *= 0
    else:
        ans *= ways[ele]

mod = 10 ** 9 + 7
print(ans % mod)