#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

ll gcd(ll a,ll b){
    if(b == 0) return a;
    else return gcd(b,a%b);
}

ll lcm(ll a,ll b){
    return a*b/gcd(a,b);
}
int main(){
    ll n,a,b,c;
    cin >> n >> a >> b >> c;

    ll ans = n/a + n/b + n/c - n/lcm(a,b) - n/lcm(b,c) - n/lcm(c,a) + n/lcm(a,lcm(b,c));

    cout << ans << endl;
    return 0;
}