[백준] 2292번 : 벌집 - C#

https://www.acmicpc.net/problem/2292

using System;

class Program
{
    static void Main() {
        string s=Console.ReadLine();
        int n=int.Parse(s);
        int a=1;
        int t=1;
        if(n==1) Console.Write(1);
        else{
            while(true){
                if(n<a){
                    Console.Write(t);
                    break;
                }
                else if(n==a){
                    Console.Write(t);
                    break;
                }
                a+=6*t;
                t++;
            }
        }
    }
}