自己看

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m;
ll a[110],b[110];
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	std::cout.tie(nullptr);
	cin>>n;
    for(ll i=1;i<=n;i++) cin>>a[i];
    cin>>m;
    for(ll i=1;i<=m;i++) cin>>b[i];
    sort(a+1,a+1+n);
    sort(b+1,b+1+m);
    ll i=1,j=1;
    ll ans=0;
    while(i<=n&&j<=m){
        if(abs(a[i]-b[j])<=1){
            i++;
            j++;
            ans++;
        }else{
            if(a[i]<b[j]){
                i++;
            }else{
                j++;
            }
        }
    }
    cout<<ans<<endl;
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}
//coder::by::M91