using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace bt_61
{
class Program
{
static void Main(string[] args)
{
int n,s=0,i;
do
{
Console.Write("nhap n="); n = int.Parse(Console.ReadLine());
} while (n <= 0);
for ( i = 1; i <= n; i++)
{
if (n % 2 == 0 && i % 2 == 0)
s = s + i;
}
for (i = 1; i <= n; i++)
{
if (n % 2 != 0 && i % 2 != 0)
s = s + i;
}
Console.Write("ket qua la:" + s);
Console.ReadKey();
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace bt_61
{
class Program
{
static void Main(string[] args)
{
int n,s=0,i;
do
{
Console.Write("nhap n="); n = int.Parse(Console.ReadLine());
} while (n <= 0);
for ( i = 1; i <= n; i++)
{
if (n % 2 == 0 && i % 2 == 0)
s = s + i;
}
for (i = 1; i <= n; i++)
{
if (n % 2 != 0 && i % 2 != 0)
s = s + i;
}
Console.Write("ket qua la:" + s);
Console.ReadKey();
}
}
}