#include<bits/stdc++.h>

#define LL long long

#define fi first

#define se second

#define mk make_pair

#define PLL pair<LL, LL>

#define PLI pair<LL, int>

#define PII pair<int, int>

#define SZ(x) ((int)x.size())

#define ull unsigned long long

using namespace std;

const int N = 2e5 + ;

const int inf = 0x3f3f3f3f;

const LL INF = 0x3f3f3f3f3f3f3f3f;

const int mod = 1e9 + ;

const double eps = 1e-;

const double PI = acos(-);

map<int, int> Map;

int n, m, y, ans, a[N], b[N];

int main() {

    scanf("%d%d", &n, &y);

    for(int i = ; i <= n; i++) scanf("%d", &a[i]);

    scanf("%d%d", &m, &y);

    for(int i = ; i <= m; i++) scanf("%d", &b[i]);

    for(int k = ; k < 1e9 + ; k *= ) {

        Map.clear();

        for(int i = ; i <= n; i++) Map[a[i] % ( * k)]++;

        for(int i = ; i <= m; i++) Map[(b[i] + k) % ( * k)]++;

        for(auto& t : Map) ans = max(ans, t.se);

    }

    ans = max(ans, );

    printf("%d\n", ans);

    return ;

}

/*

*/