#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

int main(){
    int n, a, b, c, x=0;
    cin >> n >> a >> b >> c;
    for(int i=1;i<=n;i++){
        if(i%a==0){
            x++;
            continue;
        }
        else if(i%b==0){
            x++;
            continue;
        }
        else if(i%c==0){
            x++;
            continue;
        }
    }
    cout << x;
}