fn g() -> Vec<usize> {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	s.split_whitespace().flat_map(str::parse).collect()
}
fn main() {
	let n: usize = g()[0] + 1;
	g();
	let a = g();
	g();
	let b = g();
	let mut h = vec![false; n];
	let mut c = 0;
	for a in a {
		c += a;
		h[c] = true;
	}
	for b in b {
		c -= b;
		h[c] = true;
	}
	println!("{}", h.iter().filter(|&&x| !x).count());
}