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using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text; 
using System.Threading; 
using System.Threading.Tasks;  
namespace A040 
{     
class Program    
 {          
public  int summe(int a, int b)
{             
int sum=0;            
 for (int i = a; i <= b; i++)     
        {                 sum += i;             } 
            return sum;          }         

static void Main(string[] args)        
 {            
 Program addiere= new Program();             
Thread t1 = new Thread(addiere.summe(0, 50)) { Name = "t1" }; ;  
        }     
} 
}

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class Program
{
	public void summe (object obj) //object als einziges Funktionsargument, Rückgabetyp ist void
	{             
		int[] input = (int[])obj; //unboxing
		int a = input [0];
		int b = input [1];
		int sum = Enumerable.Range (a, b - a + 1).Sum ();
		Console.WriteLine (sum);
	}

	static void Main (string[] args)
	{    
		Program addiere = new Program ();
		ParameterizedThreadStart threadStart = new ParameterizedThreadStart (addiere.summe);
		Thread t1 = new Thread (threadStart) { Name = "t1" };
		t1.Start (new int[] { 0, 50 });
	}
}