#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int a, b, c;
    cin>>a>>b>>c;
    set<int> count;

    for(int i = a; i <= n; i += a){
        count.insert(i);
    }    
    for(int i = b; i <= n; i += b){
        count.insert(i);
    }
    for(int i = c; i <= n; i += c){
        count.insert(i);
    }
    cout<< count.size() <<endl;
}