#include <iostream>
using namespace std;

long long gcd(long long x,long long y){
   if((x == 0) || (y == 0)) return 0;
   while(x != y){
      if(x > y) x -= y;
      else y -= x;
   }
   return x;
}

long long lcm(long long x,long long y){
   if((x == 0) || (y == 0)) return 0;
   return (x * y / gcd(x,y));
}

int main(){
   int a,b,c,n;
   cin >> n >> a >> b >> c;
   if(a == 1 && b == 1 && c == 1){
      cout << n << endl;
      return 0;
   }
   cout << n / a + n / b + n / c - (n / lcm(a,b) + n / lcm(b,c) + n / lcm(a,c)) + n / lcm(a,lcm(b,c)) << endl;
}