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

int main(void){
  long n, a, b, c;
  cin >> n >> a >> b >> c;
  long ans = 0;
  ans += n / a;
  ans += n / b;
  ans += n / c;
  ans -= n / lcm(a, b);
  ans -= n / lcm(b, c);
  ans -= n / lcm(c, a);
  ans += n / lcm(a, lcm(b, c));
  cout << ans << endl;
  return 0;
}