#include<bits/stdc++.h>
using namespace std;
namespace my_std{
	#define ll long long
	#define bl bool
	ll my_pow(ll a,ll b,ll mod){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res=(res*a)%mod;
			a=(a*a)%mod;
			b>>=1;
		}
		return res;
	}
	ll qpow(ll a,ll b){
		ll res=1;
		if(!b) return 1;
		while(b){
			if(b&1) res*=a;
			a*=a;
			b>>=1;
		}
		return res;
	}
	#define db double
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register ll i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register ll i=(x);i>=(y);i--)
	#define go(u) for(ll i=head[u];i;i=e[i].nxt)
	#define enter pc('\n')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	#define il inline
	#define inf 8e18
	#define random(x) rand()*rand()%(x)
	#define inv(a,mod) my_pow((a),(mod-2),(mod))
	il ll read(){
		ll sum=0,f=1;
		char ch=0;
		while(!isdigit(ch)){
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch)){
			sum=sum*10+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	il void write(ll x){
		if(x<0){
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	il void writeln(ll x){
		write(x);
		enter;
	}
	il void writesp(ll x){
		write(x);
		space;
	}
}
using namespace my_std;
ll n,m,a[20020],b[200020];
ll dfs(vector<ll> vec,ll now){
	if(vec.empty()) return 0;
	if(now>m){
		ll sum=0;
		fr(i,0,(ll)vec.size()-1) sum+=vec[i];
		return sum;
	}
	vector<ll> tmp1,tmp2;
	fr(i,0,(ll)vec.size()-1){
		if(vec[i]%b[now]) tmp1.push_back(vec[i]);
		else tmp2.push_back(vec[i]);
	}
	ll res1=dfs(tmp1,now+1),res2=dfs(tmp2,now+1);
	if(now&1) return min(res1,res2);
	else return max(res1,res2);
}
int main(){
	n=read();
	m=read();
	fr(i,1,n) a[i]=read();
	fr(i,1,m) b[i]=read();
	if(m>30) write(0);
	else{
		vector<ll> vec;
		fr(i,1,n) vec.push_back(a[i]);
		write(dfs(vec,1));
	}
}