#include<bits/stdc++.h>
using namespace std;
#define int long long
#define mod (int)(1e9+7)
#define imp {cout<<0<<endl;return 0;}
int bit(int n){
    int r=n%2;
    if(n<0)return -1;
    while(n/=2)r+=n%2;
    return r;
}
int mul(int a,int b){
    return ((a%mod)*(b%mod))%mod;
}
int fact(int n){
    if(!n)return 1;
    return mul(n,fact(n-1));
}
signed main(){
    int n,k,r=1;
    cin>>n>>k;
    if(!k){
        cout<<fact(n)<<endl;
        return 0;
    }
    vector<int> in(k);
    for(int i=0;i<k;++i)cin>>in[i];
    sort(in.begin(),in.end());
    for(int i=1;i<k;++i){
        if(bit(in[i]-in[i-1])!=bit(in[i])-bit(in[i-1]))imp;
    }
    vector<int> a;
    if(bit(in[0]))a.push_back(0);
    for(int i=0;i<k;++i)a.push_back(bit(in[i]));
    if(bit(in[k-1])!=n)a.push_back(n);
    r=fact(a[1]);
    for(int i=2;i<(int)a.size();++i){
        r=mul(r,fact(a[i]-a[i-1]));
    }
    cout<<r<<endl;
    return 0;
}