#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <iomanip>
#define L64 long long

L64 getgcd(L64 a, L64 b) {
  while (0 < a && 0 < b) {
    if (a < b)
      b = b % a;
    else
      a = a % b;
  }
  return std::max(a, b);
}
L64 getlcm(L64 a, L64 b){
  L64 gcd = getgcd(a, b);
  return (a / gcd) * b;
}
int main(void)
{
  L64 n, a, b, c, res;
  std::cin >> n >> a >> b >> c;
  res = n / a + n / b + n / c;
  L64 lcm_ab, lcm_bc, lcm_ca, lcm_all;
  lcm_ab = getlcm(a, b);
  lcm_bc = getlcm(b, c);
  lcm_ca = getlcm(c, a);
  res -= (n / lcm_ab + n / lcm_bc + n / lcm_ca);
  lcm_all = getlcm(lcm_ab, c);
  res += n / lcm_all;
  std::cout << res << std::endl;
  return 0;
}