#include <iostream>
using namespace std;

#define LL long long

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

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

LL lcm3(LL a,LL b,LL c){
  return lcm(a,lcm(b,c));
}

int main(){
  LL n;
  cin >> n;
  LL a,b,c;
  cin >> a >> b >> c;
  cout << (n/a+n/b+n/c-n/lcm(a,b)-n/lcm(b,c)-n/lcm(c,a)+n/lcm3(a,b,c)) << endl;
  return 0;
}