#include <stdio.h>

int gcd(int a, int b) {
  if (a == 0) { return b; };
  return gcd(b % a, a);
}

int lcm(int a, int b) {
  if (a*b == 0) { return 0; }
  return a / gcd(a, b) * b;
}

int main(int argc, char const* argv[])
{
  unsigned long int N, a, b, c;
  fscanf(stdin, "%lu", &N);
  fscanf(stdin, "%lu %lu %lu", &a, &b, &c);
  unsigned long int count = N / a + N / b + N / c + N / lcm(a, lcm(b, c));
  unsigned long int sa = N / lcm(a, b) + N / lcm(b, c) + N / lcm(c, a);
  printf("%lu\n", count - sa);
  return 0;
}