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//http://ja.doukaku.org/100/ 投稿用
using System;
using System.Collections.Generic;
class Program {
  static void Main(string[] args) {
    Console.WriteLine(goedel(9));
    Console.WriteLine(goedel(81));
    Console.WriteLine(goedel(230));
    Console.ReadLine();
  }

  static double goedel(int n) {
    string tmpStr = n.ToString();
    double r = 1;
    List<double> prime = new List<double>(new double[] { 2 });
    for(int i = 3; ; i += 2) {
      bool isPrime = true;
      for(int j = 3; j < i; j++) {
        if(i % j == 0) {
          isPrime = false;
          break;
        }
      }
      if(isPrime) prime.Add(i);
      if(prime.Count >= tmpStr.Length) break;
    }
    for(int i = 0; i < tmpStr.Length; i++) {
      r *= Math.Pow(prime[i], (double.Parse(tmpStr[i].ToString())));
    }
    return r;
  }
}