import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      int mod = 1000000007;
      int n = sc.nextInt();
      int m = sc.nextInt();
      int[] vArr = new int[n];
      int[] rArr = new int[m];

      for(int i = 0; i < n; i++)
        vArr[i] = sc.nextInt();
      for(int i = 0; i < m; i++)
        rArr[i] = sc.nextInt();

      long a = sc.nextInt();
      long b = sc.nextInt();
      
      long[] dpV = new long[101010]; dpV[0] = 1L;
      long[] dpR = new long[101010]; dpR[0] = 1L;

      for(int i = 0; i < n; i++)
        for(int j = dpV.length - 1; j > 0; j--) {
          if(j - vArr[i] < 0) continue;
          dpV[j] = (dpV[j] + dpV[j - vArr[i]]) % mod;
        }

      for(int i = 0; i < m; i++)
        for(int j = dpR.length - 1; j > 0; j--) {
          if(j - rArr[i] < 0) continue;
          dpR[j] = (dpR[j] + dpR[j - rArr[i]]) % mod;
        }

      for(int i = 1; i < dpV.length; i++)
        dpV[i] = (dpV[i] + dpV[i-1]);

      long cnt = 0L;
      for(int r = 1; r < dpR.length; r++) {
        if(dpR[r] == 0) continue;
        long leftV = a * r;
        long rightV = b * r;
        if(leftV > dpV.length - 1) continue;
        rightV = Math.min(rightV, dpV.length - 1);
        cnt = cnt + (long)dpR[r] * ((dpV[(int)rightV] - dpV[(int)leftV - 1]) % mod) % mod;
      }
      System.out.println(cnt % mod);
  }
}