Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split()) 
a=[int(input()) for i in range(m)] 
dp=[0]*(n+1) 
if n==1: 
    print(1) 
else: 
    if 1 not in a: 
        dp[1]=1 
    if 2 not in a: 
        dp[2]=dp[1]+1 
    for i in range(3,n+1): 
        if i not in a: 
            dp[i]=dp[i-1]+dp[i-2] 
    print(dp[-1]%1000000007)

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Runtime Error):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
j=-1
for i in range(n,-1,-1):
  if i==a[j]:
    if m>j*(-1):
      j-=1
  else:
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
print(dp[0]%1000000007)

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
for i in range(n,-1,-1):
  if i not in a:
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
print(dp[0]%1000000007)

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
for i in range(n,-1,-1):
  if i not in a:
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=(dp[i+1]+dp[i+2])%1000000007
print(dp[0])

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]

dp=[0]*(n+1)
for i in range(n,-1,-1):
  if i in a:
    dp[i] = 0
  elif i==n:
    dp[i]=1
  elif i==n-1:
    dp[i]=1
  else:
    dp[i]=dp[i+1]+dp[i+2]
    dp[i]=dp[i]%1000000007
print(dp[0])

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]

dp=[0]*(n+1)
for i in range(n,-1,-1):
  if i in a:
    dp[i] = 0
  elif i==n:
    dp[i]=1
  elif i==n-1:
    dp[i]=1
  else:
    dp[i]=dp[i+1]+dp[i+2]
print(dp[0]%1000000007)

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]

dp=[0]*(n+1)
for i in range(n,-1,-1):
  if i in a:
    dp[i] = 0
  elif i==n:
    dp[i]=1
  elif i==n-1:
    dp[i]=1
  else:
    dp[i]=dp[i+1]+dp[i+2]
print(dp[0]%1000000007)

Fixed submission:
n,m=map(int,input().split())
a = [int(input()) for i in range(m)]
dp=[0]*(n+1)
if m==0:
  for i in range(n,-1,-1):
    if i==n or i==n-1:
      dp[i]=1
    else:
      dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)
else:
  j=-1
  for i in range(n,-1,-1):
    if i==a[j]:
      if m>j*(-1):
        j-=1
    else:
      if i==n or i==n-1:
        dp[i]=1
      else:
        dp[i]=dp[i+1]+dp[i+2]
  print(dp[0]%1000000007)