public static void Main(string[] args)
int[] sequence = Console.ReadLine().Split().Select(int.Parse).ToArray();
int middleStartIndex = (sequence.Length / 2) / 2;
int middleEndIndex = middleStartIndex + sequence.Length / 2;
int summingIndex = middleStartIndex - 1;
for (int i = middleStartIndex; i < middleEndIndex; i++)
int sum = sequence[i] + sequence[summingIndex];
Console.Write($"{sum} ");
summingIndex = sequence.Length - 1;