#include <bits/stdc++.h>

long gcd(long a, long b) {
  if( a < b ) std::swap(a, b);
  while( b != 0 ) {
    a %= b;
    std::swap(a, b);
  }
  return a;
}

long lcm(long a, long b) {
  return a / gcd(a, b) * b;
}

long lcm(long a, long b, long c) {
  return lcm(lcm(a, b), c);
}

int main() {

  long N;
  long a, b, c;
  std::cin >> N;
  std::cin >> a >> b >> c;

  long res = N / a + N / b + N / c - N / lcm(a, b) - N / lcm(b, c) - N / lcm(c, a) + N / lcm(a, b, c);
  std::cout << res << std::endl;
  
  return 0;
}