const MOD: usize = 1e9 as usize + 7;
const LIMIT: usize = 100000;

fn main() {
    let mut nm = String::new();
    std::io::stdin().read_line(&mut nm).ok();
    let nm: Vec<usize> = nm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nm[0];
    let m = nm[1];
    let mut v = String::new();
    std::io::stdin().read_line(&mut v).ok();
    let v: Vec<usize> = v.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut r = String::new();
    std::io::stdin().read_line(&mut r).ok();
    let r: Vec<usize> = r.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut ab = String::new();
    std::io::stdin().read_line(&mut ab).ok();
    let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let a = ab[0];
    let b = ab[1];

    let mut vcnts = vec![0usize; LIMIT+1];
    vcnts[0] = 1;
    for i in 0..n {
        for j in (0..=LIMIT).rev() {
            if vcnts[j] == 0 { continue; }
            vcnts[j+v[i]] += vcnts[j];
            vcnts[j+v[i]] %= MOD;
        }
    }
    let mut rcnts = vec![0usize; LIMIT+1];
    rcnts[0] = 1;
    for i in 0..m {
        for j in (0..LIMIT).rev() {
            if rcnts[j] == 0 { continue; }
            rcnts[j+r[i]] += rcnts[j];
            rcnts[j+r[i]] %= MOD;
        }
    }
    for i in 0..LIMIT {
        rcnts[i+1] += rcnts[i];
        rcnts[i+1] %= MOD;
    }
    let mut result = 0usize;
    for v in 1..=LIMIT {
        if vcnts[v] == 0 { continue; }
        let right = v / a;
        let left = v / b + if v % b > 0 { 1 } else { 0 };
        result += vcnts[v] * (MOD + rcnts[right] - rcnts[left-1]) % MOD;
        result %= MOD;
    }
    println!("{}", result);
}