Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0

if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
if m!=0:
    for i in a:
        b[i]=0
    if m>=2:    
        if a[0]==1 and a[1]==2:
            b[1],b[2]=0,0
    elif a[0]==1:
        b[2]=1
    elif a[0]==2:
        b[1]=1
    else:    
        b[1],b[2]=1,2
else:    
    b[1],b[2]=1,2  
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
if m!=0:
    for i in a:
        b[i]=0
    if a[0]==1 and a[1]==2:
        b[1],b[2]=0,0
    elif a[0]==1:
        b[2]=1
    elif a[0]==2:
        b[1]=1
    else:    
        b[1],b[2]=1,2
else:    
    b[1],b[2]=1,2  
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
if m!=0:
    for i in a:
        b[i]=0
    if a[0]==1 and a[1]==2:
        continue
    elif a[0]==1:
        b[2]=1
    elif a[0]==2:
        b[1]=1
    else:    
        b[1],b[2]=1,2
else:    
        b[1],b[2]=1,2        
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
if m!=0:
    for i in a:
        b[i]=0
    if a[0]==1:
        b[2]=1
    elif a[0]==2:
        b[1]=1
    else:    
        b[1],b[2]=1,2
else:    
        b[1],b[2]=1,2        
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
for i in a:
    b[i]=0
if a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[-1]*(n+1)
for i in a:
    b[i]=0
if a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]!=0:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Buggy python submission (verdict: Runtime Error):
n,m,*a=map(int,open(0).read().split())
b=[0]*(n+1)
if a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if not i in a:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])

Fixed submission:
n,m,*a=map(int,open(0).read().split())
if n==1:
    print(1)
    exit()
b=[-1]*(n+1)
a+=[0,0]
for i in a:
    b[i]=0
if a[0]==1 and a[1]==2:
    b[1],b[2]=0,0
elif a[0]==1:
    b[2]=1
elif a[0]==2:
    b[1]=1
else:    
    b[1],b[2]=1,2
for i in range(3,n+1):
    if b[i]==-1:
        b[i]=(b[i-1]+b[i-2])%1000000007
print(b[-1])