C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
					
public class Program
{
	public static void Main()
	{
		{
            int n;
            Console.WriteLine("Nhap n: ");
            n = int.Parse(Console.ReadLine());

            int k = 1;
            int tong = k;
            while (tong < n)
            {
                tong += k;
                if (tong < n)
                {
                    k++;
                }
            }
            Console.WriteLine(k);
        }
	}
}

​x
 
using System;
                    
public class Program
{
    public static void Main()
    {
        {
            int n;
            Console.WriteLine("Nhap n: ");
            n = int.Parse(Console.ReadLine());
​
            int k = 1;
            int tong = k;
            while (tong < n)
            {
                tong += k;
                if (tong < n)
                {
                    k++;
                }
            }
            Console.WriteLine(k);
        }
    }
}

Unhandled exception. System.Exception: Must be a numerical value greater than or equal to 1
at Program.CheckIfValueIsValid(String settingName, String settingValue)
at Program.Main()
Command terminated by signal 6

Last Run:	8:04:48 pm
Compile:	0.005s
Execute:	0.18s
Memory:	5.09Mb
CPU:	0.185s

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