import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int m = Integer.parseInt(sa[1]);

		sa = br.readLine().split(" ");
		int[] v = new int[n];
		for (int i = 0; i < n; i++) {
			v[i] = Integer.parseInt(sa[i]);
		}

		sa = br.readLine().split(" ");
		int[] r = new int[m];
		for (int i = 0; i < m; i++) {
			r[i] = Integer.parseInt(sa[i]);
		}

		sa = br.readLine().split(" ");
		int a = Integer.parseInt(sa[0]);
		int b = Integer.parseInt(sa[1]);
		br.close();

		int mod = 1000000007;
		int mx = 100000;
		long[] dpv = dp(v, n);
		for (int i = 1; i <= mx; i++) {
			dpv[i] += dpv[i - 1];
			dpv[i] %= mod;
		}
		long[] dpr = dp(r, m);

		long ans = 0;
		for (int i = 1; i <= mx; i++) {
			int min = i * a;
			if (min > mx) {
				break;
			}
			int max = Math.min(i * b, mx);
			long cv = dpv[max] - dpv[min - 1] + mod;
			ans += cv * dpr[i];
			ans %= mod;
		}
		System.out.println(ans);
	}

	static long[] dp(int[] v, int n) {
		int mod = 1000000007;
		int mx = 100000;
		long[] dp = new long[mx + 1];
		dp[0] = 1;
		for (int i = 0; i < n; i++) {
			long[] work = new long[mx + 1];
			for (int j = mx - v[i] + 1; j <= mx; j++) {
				work[j] = dp[j];
			}
			for (int j = mx - v[i]; j >= 0; j--) {
				work[j + v[i]] += dp[j];
				work[j + v[i]] %= mod;
				work[j] = dp[j];
			}
			dp = work;
		}
		return dp;
	}
}