Buggy python submission (verdict: Time Limit Exceeded):
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
if 1 in l:
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        pass
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if S in l:
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])
#print(ans)

Fixed submission:
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
c=0
if 1 in l:
    c+=1
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        c+=1
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if c>=len(l):
        ans.append((ans[-1]+ans[-2])%1000000007)
    elif S==l[c]:
        c+=1
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])

Buggy python submission (verdict: Runtime Error):
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
if 1 in l:
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        pass
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if S in l:
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])
//print(ans)

Fixed submission:
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
c=0
if 1 in l:
    c+=1
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        c+=1
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if c>=len(l):
        ans.append((ans[-1]+ans[-2])%1000000007)
    elif S==l[c]:
        c+=1
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])

Buggy python submission (verdict: Runtime Error):
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if not 1 in l:
    two=1
else:
    two=0
if not 2 in l:
    if two==1:
        one=2
    else:
        one=1
lis=[two,one]
for _ in range(3,n+1):
    if not _ in l:
        lis.append((lis[_-3]+lis[_-2])%1000000007)
    else:
        lis.append(0)
print(lis[-1])

Fixed submission:
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
c=0
if 1 in l:
    c+=1
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        c+=1
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if c>=len(l):
        ans.append((ans[-1]+ans[-2])%1000000007)
    elif S==l[c]:
        c+=1
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])

Buggy python submission (verdict: Runtime Error):
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if not 1 in l:
    two=1
if not 2 in l:
    if two==1:
        one=2
    else:
        one=1
lis=[two,one]
for _ in range(3,n+1):
    if not _ in l:
        lis.append((lis[_-3]+lis[_-2])%1000000007)
    else:
        lis.append(0)
print(lis[-1])

Fixed submission:
import sys
n,m=map(int,input().split())
l=[]
for i in range(m):
    l.append(int(input()))
if n==1:
    if 1 in l:
        print(0)
    else:
        print(1)
    sys.exit()
ans1=0
ans2=0
c=0
if 1 in l:
    c+=1
    if 2 in l:
        print(0)
        sys.exit()
    else:
        ans2=1
else:
    ans1=1
    if 2 in l:
        c+=1
    else:
        ans2=2
ans=[0,ans1,ans2]
S=2
while S<n:
    S+=1
    if c>=len(l):
        ans.append((ans[-1]+ans[-2])%1000000007)
    elif S==l[c]:
        c+=1
        ans.append(0)
    else:
        ans.append((ans[-1]+ans[-2])%1000000007)
print(ans[-1])