fun main() {
    val builder = StringBuilder()

    val mod = 1000000007L

    val (n, m) = readInputLine().split(" ").map { it.toInt() }

    val vCnt = Array(n) { LongArray(100000 + 1) }
    val rCnt = Array(m) { LongArray(100000 + 1) }

    readInputLine().split(" ").forEachIndexed { index, s ->
        val v = s.toInt()
        if (index != 0) {
            for (i in 1..(100000 - v)) {
                vCnt[index][i] = (vCnt[index][i] + vCnt[index - 1][i]) % mod
                vCnt[index][i + v] = (vCnt[index][i + v] + vCnt[index - 1][i]) % mod
            }
        }
        vCnt[index][v] = (vCnt[index][v] + 1) % mod 
    }

    readInputLine().split(" ").forEachIndexed { index, s ->
        val r = s.toInt()
        if (index != 0) {
            for (i in 1..(100000 - r)) {
                rCnt[index][i] = (rCnt[index][i] + rCnt[index - 1][i]) % mod
                rCnt[index][i + r] = (rCnt[index][i + r] + rCnt[index - 1][i]) % mod
            }
        }
        rCnt[index][r] = (rCnt[index][r] + 1) % mod
    }

    val (a, b) = readInputLine().split(" ").map { it.toLong() }

    var ans = 0L

    val vCntSum = LongArray(100000 + 1)

    for (i in 1..100000) {
        vCntSum[i] = vCnt[n - 1][i]
    }

    for (i in 1..100000) {
        vCntSum[i] = (vCntSum[i] + vCntSum[i - 1]) % mod
    }

    for (i in 1..100000) {
        if (rCnt[m - 1][i] != 0L) {
            val l = i.toLong() * a
            val r = (i.toLong() * b).coerceAtMost(100000)
            if (l <= r) {
                ans = (ans + (vCntSum[r.toInt()] - vCntSum[l.toInt() - 1]) * rCnt[m - 1][i]) % mod
            }
        }
    }

    builder.appendln(ans)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}