为什么输入六个数就会崩溃？？？

   int[] num = new int[6];
            
            int sum=0;
            Console.Write("请输入数组元素：");

            for(int i=0; i<num.Length;i++)
            {
               
                num[i] = int.Parse(Console.ReadLine());

                
                sum+=num[i];
              
            }
            Console.Write("这六个数的和为" + sum);