#include<iostream>
using namespace std;
int main(){
  long long n, a, b, c;
  cin >> n >> a >> b >> c;
  long long multiple = 0;
  for(long long i = 1; i <= n; i++){
    if(i % a == 0 || i % b == 0 || i % c == 0){
      multiple++;
    }
  }
  cout << multiple;
}