#include <bits/stdc++.h>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
/* ここからが本編 */
/*  */

ull gcd(ull m, ull n)
{
  if(m < n) swap(m,n);
  // m >= n
  while(n) {
	ull tmp = n;
	n = m % n;
	m = tmp;
  }
  return m;
}
ull lcm(ull m,ull n) {
  return m*(n/gcd(m,n));
}
int main(void)
{
  int i,j,k;
  ull n;
  ull a,b,c;
  ull ans;
  cin >> n >> a >> b >> c;
  ans = n/a + n/b + n/c 
	- n/lcm(a,b) - n/lcm(b,c) - n/lcm(c,a)
	+ n/lcm(a,lcm(b,c));
  cout << ans << endl;
  return 0;
}