#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;

int main(){
    long long N,a,b,c;
    cin>>N>>a>>b>>c;
    long long ans=N/a+N/b+N/c-N/lcm(a,b)-N/lcm(a,c)-N/lcm(b,c)+N/lcm(lcm(a,b),c);
    cout<<ans<<endl;
}