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- using System;
- using System.Numerics;
- public class Program
- {
- public static void Main()
- {
- int n = int.Parse(Console.ReadLine());
- int faktn = 1;
- int faktn2 = 1;
- int faktn1 =1;
- BigInteger sum = 1;
- if(0<=n && n<=100)
- {
- for(int i = 1; i<=n;i++)
- {
- faktn *= i;
- }
- for(int i=1;i<=n*2;i++)
- {
- faktn2 *= i;
- }
- for(int i =1; i<=n+1;i++)
- {
- faktn1 *=i;
- }
- sum = faktn2 / (faktn1*faktn);
- Console.WriteLine(sum);
- }
- }
- }
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