#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    ll n,a,b,c;
    cin>>n>>a>>b>>c;
    cout<<n/a+n/b+n/c-n/lcm(a,b)-n/lcm(a,c)-n/lcm(b,c)+n/lcm(a,lcm(b,c))<<endl;
    return 0;
}