#include <bits/stdc++.h>
using namespace std;

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

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

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