#import collections
import sys
input = sys.stdin.readline

#n = int(input())
#l = list(map(int, input().split()))

'''
A=[]
B=[]
for i in range():
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)'''

fibo = [1, 1]
for i in range(1, 10**5+2):
    fibo.append(fibo[i]+fibo[i-1])

n,m=map(int, input().split())

a=[]
for i in range(m):
    a.append(int(input()))

flg=True
for i in range(m-1):
    if a[i]+1==a[i+1]:
        flg=False
        break
#print(a[0]==a[1],flg)
if not flg:
    print(0)
else:
    ans=1
    if m==1:
        #print(fibo[a[0]-1],fibo[n-a[0]-1])
        print(fibo[a[0]-1]*fibo[n-a[0]-1] % (10**9+7))
    elif m==0:
        print((fibo[n]-2)%(10**9+7))
    else:
        for i in range(1,m):
            #print(a[i],a[i-1])
            #print(fibo[21])
            #print(fibo[a[i]-a[i-1]-1])
            ans*=fibo[a[i]-a[i-1]-2]
            print(ans % (10**9+7))
        #print(fibo[a[0]-1],fibo[n-a[m-1]-1],fibo[10])
        print(ans*fibo[a[0]-1]*fibo[n-a[m-1]-1]%(10**9+7))


