#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <cstdlib>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <functional> 
#include <iomanip>
#include <unordered_map>
#include <memory.h>
#include <unordered_set>
#include <fstream>

using namespace std;

const long long int MOD = 1e9 + 7;
int V[1000];
int R[1000];
int A, B;
int n, m;
long long int dp1[2][100001];
long long int dp2[2][100001];
long long int res = 0;
long long int psum[100001];

int main(void)
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	cin >> n >> m;
	for (int i = 0; i < n; i++)
	{
		cin >> V[i];
	}
	for (int i = 0; i < m; i++)
	{
		cin >> R[i];
	}
	cin >> A >> B;
	
	dp1[1][0] = 1;
	dp2[1][0] = 1;

	for (int i = 0; i < n; i++)
	{
		memcpy(dp1[0], dp1[1], sizeof(dp1[1]));
		memset(dp1[1], 0, sizeof(dp1[1]));
		for (int j = 100000; j >= 0; j--)
		{
			if (dp1[0][j] == 0)
			{
				continue;
			}
			dp1[1][j] = ((dp1[1][j] % MOD) + (dp1[0][j] % MOD) % MOD);
			dp1[1][j] %= MOD;
			if (j + V[i] <= 100000)
			{
				dp1[1][j + V[i]] = ((dp1[1][j + V[i]] % MOD) + (dp1[0][j] % MOD) % MOD);
				dp1[1][j + V[i]] %= MOD;
			}
		}
	}

	for (int i = 0; i < m; i++)
	{
		memcpy(dp2[0], dp2[1], sizeof(dp2[1]));
		memset(dp2[1], 0, sizeof(dp2[1]));
		for (int j = 100000; j >= 0; j--)
		{
			if (dp2[0][j] == 0)
			{
				continue;
			}
			dp2[1][j] = ((dp2[1][j] % MOD) + (dp2[0][j] % MOD) % MOD);
			dp2[1][j] %= MOD;
			if (j + R[i] <= 100000)
			{
				dp2[1][j + R[i]] = ((dp2[1][j + R[i]] % MOD) + (dp2[0][j] % MOD) % MOD);
				dp2[1][j + R[i]] %= MOD;
			}
		}
	}

	psum[0] = 0;
	for (int i = 1; i <= 100000; i++)
	{
		psum[i] = ((psum[i - 1] % MOD) + (dp1[1][i] % MOD) % MOD);
		psum[i] %= MOD;
	}

	for (int j = 1; j <= 100000; j++)
	{
		if (dp2[1][j] == 0)
		{
			continue;
		}
		int L = A * j;
		int R = B * j;
		R = min(R, 100000);
		if (L > 100000)
		{
			L = 100001;
		}
		long long int val = psum[R] - psum[L - 1];
		//cout << L << ' ' << R << ' ' << j << '\n';
		val %= MOD;
		if (val < 0)
		{
			val += MOD;
		}
		res = ((res % MOD) + ((val % MOD) * (dp2[1][j] % MOD) % MOD) % MOD);
		res %= MOD;
	}

	cout << res << '\n';

	return 0;
}