#include <iostream>
using namespace std;
int euq(int a, int b){
  if(a % b == 0){
    return b;
  }
  int tmp = a % b;
  a = b;
  b = tmp;
  return euq(a,b);
}
int kobai(int a,int b){
  return (a*b)/euq(a,b);
}
long long kobai2(long long a,long long b, long long c){
  int tmp = (a*b)/euq(a,b);
  return (long long)(tmp*c)/euq(tmp,c);
}
int main(){
  long long n,a,b,c;cin>>n>>a>>b>>c;
  cout << (n/a)+(n/b)+(n/c)-(n/kobai(a,b))-(n/kobai(a,c))-(n/kobai(b,c))+(n/kobai2(a,b,c)) << endl;

}