use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    
    let mut iter = buf.split_whitespace();
    
    let n: usize = iter.next().unwrap().parse().unwrap();
    let a: usize = iter.next().unwrap().parse().unwrap();
    let b: usize = iter.next().unwrap().parse().unwrap();
    let c: usize = iter.next().unwrap().parse().unwrap();
    
    let mut answer: usize = n/a;
    
    if b % a != 0 {
        answer += n/b;
        let mut b_mul: usize = b;
        while b_mul <= n {
            if b_mul % a == 0 {
                answer -= 1;
            }
            b_mul += b;
        }
    }
    if c % a != 0 && c % b != 0 {
        answer += n/c;
        let mut c_mul: usize = c;
        while c_mul <= n {
            if c_mul % a == 0 ||
               c_mul % b == 0 {
                answer -= 1;
            }
            c_mul += c;
        }
    }
    
    println!("{}", answer);
}