#include<iostream>
#include<map>
#include<string>
#include<vector>
#include<algorithm>
#include<numeric>
#include<cmath>
#include<queue>
using namespace std;
long long int gcd(long long int a, long long int b){
  long long int c;
  while( a != 0 ){
    c = a;
    a = b%a;
    b = c;
  }
  return b;
}
long long int lcm(long long int a, long long int b){
  long long int c = a / gcd(a, b) * b;
  return c;
}
int main(){

  long long int n, a, b, c;
  cin >> n >> a >> b >> c;
  long long int tmp = 0;
  tmp = n/a + n/b + n/c - (n/(a*b/gcd(a,b))) - (n/(b*c/gcd(b,c))) -(n/(c*a/gcd(c,a))) + (n/(lcm(a, lcm(b, c))));
  cout << tmp << endl;

  return 0;
}





// EOF