#include<iostream>
using namespace std;
long long gcd(long long a,long long b){
    if(b == 0) return a;
    else gcd(b,a%b);
}
long long lcm(long long a,long long b){
    return a*b/gcd(a,b);
}
int main(){
    int N;
    long long a,b,c;
    long long ab,bc,ca;
    long long abc;
    long long ans = 0;
    cin >> N;
    cin >> a >> b >> c;
    ab = lcm(a,b);
    bc = lcm(b,c);
    ca = lcm(c,a);
    abc = lcm(ab,c);
    ans += N/a + N/b + N/c;
    ans -= N/(ab) + N/(bc) + N/(ca);
    ans += N/(abc);
    cout << ans << endl;
    return 0;
}