using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _14.EqualElemtsInArray
{
class Program
{
static void Main(string[] args)
{
int[] arrayElements = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
bool IsEqual = false;
for (int cnt = 0; cnt < arrayElements.Length - 1; cnt++)
{
if (arrayElements[cnt] == arrayElements[cnt + 1])
{
IsEqual = true;
} else
{
IsEqual = false;
break;
}
}
if (IsEqual)
{
Console.WriteLine("Yes");
} else
{
Console.WriteLine("No");
}
}
}
}
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