use std::io::{self, BufRead};
fn main() {
    let stdin = io::stdin();
    let mut iter = stdin.lock().lines();

    let binding = iter.next().unwrap().unwrap();
    let times = binding
        .split_whitespace()
        .skip(1)
        .map(|x| x.parse::<u32>().unwrap());
    let binding = iter.next().unwrap().unwrap();
    let dists = binding
        .split_whitespace()
        .skip(1)
        .map(|x| x.parse::<u32>().unwrap());
    let mut races = times.zip(dists);
    let mut res = 1;
    for (time, dist) in races {
        let mut ct = 0;
        for i in (1..time) {
            if i * (time - i) > dist {
                ct += 1;
            }
        }
        res *= ct;
    }
    print!("{}", res);
}