using System;

public class Program

{

    static void Cap100(int[] A)

        {

            if (A.Length != 0)

            {

                for (int a = 0; a < A.Length; a++)

                {

                    for (int i = a + 1; i < A.Length; i++)

                    {

                        if ((A[i] + A[a]) == 100)

                        {

                            Console.WriteLine($"Gia tri thu {a} va thu {i} trong mang: {A[a]} + {A[i]} = 100");

                        }

                    }

                }

            }

            else

            {

                Console.WriteLine("Mang A khong co phan tu nao!");

            }

        }

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}