#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

i64 N;
i64 a,b,c;

i64 gcd(i64 x,i64 y){
  if(y == 0){
    return x;
  }
  return gcd(y , x % y);
}

i64 lcm(i64 x,i64 y){
  return x / gcd(x,y) * y;
}

int main(){
  cin >> N >> a >> b >> c;

  i64 ans = N / a + N / b + N / c - (N / lcm(a,b)) - (N / lcm(a,c)) - (N / lcm(b , c)) + (N / lcm(lcm(a,b),c));
  cout << ans << endl;

}