macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        #[allow(unused_mut)]
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        #[allow(non_snake_case)]
        let mut $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        eprintln!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}
use std::cmp;

fn solve(arr1: &Vec<u32>, arr2: &Vec<u32>) -> usize {
    let (mut num, mut b, mut i, mut j) = if arr1[0] < arr2[0] {
        (arr1[0], false, 1, 0)
    } else {
        (arr2[0], true, 0, 1)
    };
    let mut ans = 1;
    loop {
        if !b && j < arr2.len() {
            if arr2[j] > num {
                b = !b;
                num = arr2[j];
                ans += 1;
            }
            j += 1;
        } else if b && i < arr1.len() {
            if arr1[i] > num {
                b = !b;
                num = arr1[i];
                ans += 1;
            }
            i += 1;
        } else {
            break;
        }
    }
    ans
}

fn main() {
    input!{
        nw: usize,
        w: [u32; nw],
        nb: usize,
        b: [u32; nb],
    }
    w.sort();
    b.sort();

    println!("{}", cmp::max(solve(&w, &b), solve(&b, &w)));
}