class Program
{
static void Main(string[] args)
{
int n, h = 0;
Console.Write("请输入一个整数n=");
n = Convert.ToInt16(Console.ReadLine());
for (int i=0;i<=n ;i ++)
{
if (i % 2 != 0)
h = i + h;
}
Console.Write(Add(h ,i));
Console .ReadLine ();
}
public static int Add(int i,int h )
{
return h = i + h;
}
}
}