fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut b = String::new();
    std::io::stdin().read_line(&mut b).ok();
    let b: Vec<usize> = b.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut result = 0usize;
    let mut ok = vec![false; n-1];
    for i in 0..n-1 {
        let minval = b[i].min(b[i+1]);
        let maxval = b[i].max(b[i+1]);
        ok[i] = a[i] + maxval < a[i+1] + minval;
        if ok[i] {
            result += 1;
        }
    }
    let mut idx = 0usize;
    for i in 0..n-1 {
        if !ok[i] {
            continue;
        }
        idx = idx.max(i+2);
        while idx < n {
            let minval = b[i].min(b[idx]);
            let maxval = b[i].max(b[idx]);
            if ok[idx-1] && a[i] + maxval < a[idx] + minval {
                idx += 1;
            } else {
                break;
            }
        }
        result += idx - i - 2;
    }
    println!("{}", result);
}