import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.PriorityQueue;
import java.util.Random;


public class Main {
	
	public static void main(String[] args) {
		new Main().run();
	}
	
	final long MOD=(long)1e9+7;

	long ADD(long a,long b) {
		return a+b>=MOD?a+b-MOD:a+b;
	}

	void run() {
		FastScanner sc=new FastScanner();
		// A <= Σv/Σr <= B
		// AΣr<= Σv <= BΣr
		// AR <= V  <= BR
		// ただし R=ΣR,V=Σv
		
		int N=sc.nextInt();
		int M=sc.nextInt();
		int[] V=new int[N];
		int[] R=new int[M];
		for (int i=0;i<N;++i) V[i]=sc.nextInt();
		for (int i=0;i<M;++i) R[i]=sc.nextInt();
		int A=sc.nextInt();
		int B=sc.nextInt();
		long[] dpV=new long[100001];
		long[] dpR=new long[100001];
		dpV[0]=1;
		dpR[0]=1;
		for (int i=0;i<N;++i) {
			for (int j=dpV.length-1;j>=0;--j) if (j+V[i]<dpV.length) dpV[j+V[i]]=ADD(dpV[j+V[i]],dpV[j]);
		}
		for (int i=0;i<M;++i) {
			for (int j=dpR.length-1;j>=0;--j) if (j+R[i]<dpR.length) dpR[j+R[i]]=ADD(dpR[j+R[i]],dpR[j]);
		}
		for (int i=1;i<dpV.length;++i) {
			dpV[i]=ADD(dpV[i],dpV[i-1]);
		}
		long ans=0;
		for (int i=1;i<dpR.length;++i) {
			int upper=Math.min(dpV.length-1, B*i);
			int lower=Math.min(dpV.length-1, A*i-1);
			ans+=dpR[i]*(dpV[upper]-dpV[lower])%MOD;
			ans%=MOD;
		}
		ans=(ans%MOD+MOD)%MOD;
		System.out.println(ans);
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}




class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
    public boolean hasNext() { skipUnprintable(); return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
    	return (int)nextLong();
    }
}