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 + n/b + n/c;
    
    let mut b_mul: usize = b;
    while b_mul <= n {
        if b_mul % a == 0 {
            answer -= 1;
        }
        b_mul += b;
    }
    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);
}