#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N; cin >> N;
  int A, B, C; cin >> A >> B >> C;
  int ans = N / A + N / B + N / C;
  ans -= N / ( A * B / __gcd( A, B ) );
  ans -= N / ( B * C / __gcd( B, C ) );
  ans -= N / ( A * C / __gcd( A, C ) );
  ans += N / ( A * B * C / __gcd( A, __gcd( B, C ) ) );
  cout << ans << endl;
  return 0;
}