fn gcd(a: isize, b: isize) -> isize {
    if b == 0 { return a; }
    gcd(b, a%b)
}

fn lcm(a: isize, b: isize) -> isize {
    a / gcd(a, b) * b
}

fn main() {
    let mut nlh = String::new();
    std::io::stdin().read_line(&mut nlh).ok();
    let nlh: Vec<isize> = nlh.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nlh[0] as usize;
    let l = nlh[1];
    let h = nlh[2];
    let mut c = String::new();
    std::io::stdin().read_line(&mut c).ok();
    let c: Vec<isize> = c.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut result = 0isize;
    for i in 1..1<<n {
        let targets = (0..n).filter(|&j| ((i >> j) & 1) == 1).collect::<Vec<_>>();
        let used_cnt = targets.len() as isize;
        let mut lcmval = 1isize;
        let mut over = false;
        for &v in targets.iter() {
            lcmval = lcm(lcmval, c[v]);
            if lcmval > h {
                over = true;
                break;
            }
        }
        if over { continue; }
        if used_cnt % 2 == 1 {
            result += (h / lcmval - (l-1) / lcmval) * used_cnt;
        } else {
            result -= (h / lcmval - (l-1) / lcmval) * used_cnt;
        }
    }
    println!("{}", result);
}