#include<bits/stdc++.h>
using namespace std;
int gcd(int a,int b){
    if(b==0){
        return a;
    }
    return gcd(b,a%b);
}
int lcm(int a,int b){
    return a*b/gcd(a,b);
}
int main(){
    int n,a,b,c;cin >> n >> a >> b >> c;
    cout << n/a+n/b+n/c-n/lcm(a,b)-n/lcm(b,c)-n/lcm(c,a)+n/lcm(lcm(a,b),c) << endl;
}