#include <algorithm>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <functional>
#include <iostream>
#include <queue>
#include <stack>
#include <string>
#include <vector>
#define INF 10000000
#define PI 3.14159265358979323846
using namespace std;
typedef long long ll;
typedef pair<int, int> p;
typedef queue<int> qi;
typedef queue< pair<int, int> > qp;
typedef vector<int> vi;
typedef vector<int, int> vii;
typedef vector< pair<int, int> > vp;
int dx[4] = { 0, 1, 0, -1 };
int dy[4] = { 1, 0, -1, 0 };

int gcd(int x, int y){
    int r;
    while((r = x % y) != 0){
        x = y;
        y = r;
    }
    return y;
}

int lcm(int x, int y){
    return (x * y / gcd(x, y));
}

int main(){
	ios::sync_with_stdio(false);

	ll n;
  ll a, b, c;
	cin >> n;
  cin >> a >> b >> c;

  cout << (n/a + n/b + n/c) - n/lcm(a, b) - n/lcm(a, c) - n/lcm(b, c) + n/lcm(lcm(a,b),c) << endl;

	return 0;
}