use std::io::*;
const MOD: usize = 1_000_000_007;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let m: usize = itr.next().unwrap().parse().unwrap();

    let v: Vec<usize> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();
    let r: Vec<usize> = (0..m)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();
    let a: usize = itr.next().unwrap().parse().unwrap();
    let b: usize = itr.next().unwrap().parse().unwrap();
    let c: usize = v.iter().sum();
    let d: usize = r.iter().sum();

    let mut dp: Vec<usize> = vec![0; c + 1];
    dp[0] = 1;
    for i in 0..n {
        for j in (0..c - v[i] + 1).rev() {
            dp[j + v[i]] = (dp[j + v[i]] + dp[j]) % MOD;
        }
    }
    let mut dp2: Vec<usize> = vec![0; d + 1];
    dp2[0] = 1;
    for i in 0..m {
        for j in (0..d - r[i] + 1).rev() {
            dp2[j + r[i]] = (dp2[j + r[i]] + dp2[j]) % MOD;
        }
    }

    for i in 0..c {
        dp[i + 1] += dp[i];
        dp[i + 1] %= MOD;
    }

    // a * sum(r) <= sum(v) <= b * sum(r)
    let mut ans = 0;
    for sr in 1..d + 1 {
        let min = a * sr;
        let max = b * sr;
        if min > c {
            break;
        }
        ans = (ans + (dp[std::cmp::min(c, max)] + MOD - dp[min - 1]) % MOD * dp2[sr] % MOD) % MOD;
    }
    println!("{}", ans);
}