#![allow(non_snake_case)]

fn main() {
#[allow(unused_imports)]
    use std::cmp::{min, max};
    use std::io::{Read, Write, BufWriter};
    let mut a = Vec::new();
    std::io::stdin().read_to_end(&mut a).unwrap();
    let a = String::from_utf8(a).unwrap();
    let mut a = a.split_whitespace();
    let mut b = BufWriter::new(std::io::stdout());
    macro_rules! yomu { () => (a.next().unwrap().parse().unwrap()) }
    macro_rules! kaku { ($($arg:tt)*) => (writeln!(b, $($arg)*).unwrap()) }

    let N: usize = yomu!();
    let mut A: Vec<i32> = Vec::new();
    let mut B: Vec<i32> = Vec::new();
    let mut D: Vec<i32> = Vec::new();
    for _ in 0..N+1 { A.push(yomu!()); }
    for _ in 0..N+1 { B.push(yomu!()); }
    for _ in 0..N { D.push(yomu!()); }
    D.sort();
    D.reverse();

    let mut l = 0;
    let mut r = N + 1;
    while r - l > 1 {
        let m: usize = (l + r) / 2;
        let mut dp = vec![vec![false; m+1]; m+1];
        dp[0][0] = true;
        for i in 0..m {
            for j in 0..m {
                if i+j >= m { break }
                if !dp[i][j] { continue }
                if A[i+1] + B[j] >= D[N-m+i+j] {
                    dp[i+1][j] = true;
                }
                if A[i] + B[j+1] >= D[N-m+i+j] {
                    dp[i][j+1] = true;
                }
            }
        }
        let mut saidai = 0;
        for i in 0..m+1 {
            for j in 0..m+1 {
                if dp[i][j] {
                    saidai = max(saidai, i+j);
                }
            }
        }
        if saidai == m {
            l = m;
        } else {
            r = m;
        }
    }
    kaku!("{}", l);
}