use std::io::Read;
use std::mem;

fn gcd(mut x: usize, mut y: usize) -> usize {
    while x != 0 {
        y %= x;
        mem::swap(&mut x, &mut y);
    }
    y
}

fn lcm(x: usize, y: usize) -> usize {
    let xy_gcd = gcd(x, y);
    x * y / xy_gcd
}

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 ab_lcm = lcm(a, b);
    let ac_lcm = lcm(a, c);
    let bc_lcm = lcm(b, c);
    let abc_lcm = lcm(a, bc_lcm);
    
    println!("{}", n/a + n/b + n/c - n/ab_lcm - n/ac_lcm - n/bc_lcm + n/abc_lcm);
}