Buggy python submission (verdict: Runtime Error):
import sympy as sym #sympyのインポート
def Fib(n):
    x = sym.symbols('x',nonnegative=True,integer=True) #変数xの宣言(非負の整数)
    Fib=1/sym.sqrt(5)*(((1+sym.sqrt(5))/2)**(n-1)-((1-sym.sqrt(5))/2)**(n-1)) #一般項の式
    result=Fib.subs(x,n) #xにnを代入
    result=result.evalf() #式を浮動小数点数として評価
    return int(result)
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input()))

if start == []:
    print(Fib(n+1))
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(len(pstart)-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        ans = 1
        for w in newlist:
            ans = (ans*Fib(w))%1000000007
        print(ans)         

Fixed submission:
def Fib(n):
    a,b = 1,1
    if n == 1:
        return 1
    elif n == 2:
        return 1
    else:
        for i in range(n-2):
            a,b = b,a+b
        return b
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input()))

if start == []:
    print(Fib(n+1)%1000000007)
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(len(pstart)-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        ans = 1
        #print(newlist)
        for w in newlist:
            #print(Fib(w-1))
            #print(ans)
            ans = (ans*Fib(w-1))%1000000007
        print(ans)

Buggy python submission (verdict: Runtime Error):
import math
def f(k):
    aaa = 1/math.sqrt(5)*(((1+math.sqrt(5))/2)**k-((1-math.sqrt(5))/2)**k)%1000000007
    return aaa
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input()))

if start == []:
    print(f(n-1))
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(n-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        for w in newlist:
            ans = 1
            ans = ans*f(w-1)%1000000007      
        print(ans)         

Fixed submission:
def Fib(n):
    a,b = 1,1
    if n == 1:
        return 1
    elif n == 2:
        return 1
    else:
        for i in range(n-2):
            a,b = b,a+b
        return b
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input()))

if start == []:
    print(Fib(n+1)%1000000007)
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(len(pstart)-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        ans = 1
        #print(newlist)
        for w in newlist:
            #print(Fib(w-1))
            #print(ans)
            ans = (ans*Fib(w-1))%1000000007
        print(ans)

Buggy python submission (verdict: Runtime Error):
import math
def f(k):
    aaa = 1/math.sqrt(5)*(((1+math.sqrt(5))/2)**k-((1-math.sqrt(5))/2)**k)%1000000007
    return aaa
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input())
if start == []:
    print(f(n-1))
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(n-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        for w in newlist:
            ans = 1
            ans = ans*f(w-1)%1000000007      
        print(ans)         

Fixed submission:
def Fib(n):
    a,b = 1,1
    if n == 1:
        return 1
    elif n == 2:
        return 1
    else:
        for i in range(n-2):
            a,b = b,a+b
        return b
    
n,m = map(int,input().split())
start = []
for i in range(m):
    start.append(int(input()))

if start == []:
    print(Fib(n+1)%1000000007)
else:
    pstart = [-1]+start+[n+1] #スタートとゴールを追加
    newlist = [] #距離のリスト
    for j in range(len(pstart)-1):
        newlist.append(pstart[j+1]-pstart[j]) #障害物同士の距離を測る
    if 1 in newlist[1:len(newlist)-1]:
                 print(0)
    else: #ちゃんと距離が出そうなとき
        ans = 1
        #print(newlist)
        for w in newlist:
            #print(Fib(w-1))
            #print(ans)
            ans = (ans*Fib(w-1))%1000000007
        print(ans)