using System;
using System.Linq;
namespace _13.IncrsingElmInArray
{
class Program
{
static void Main(string[] args)
{
int[] arrayElements = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
bool IsIncreasing = false;
for (int cnt = 0; cnt < arrayElements.Length - 1; cnt++)
{
if (IsIncreasing = arrayElements[cnt] < arrayElements[cnt + 1])
{
IsIncreasing = true;
} else
{
IsIncreasing = false;
break;
}
}
if (IsIncreasing)
{
Console.WriteLine("Yes");
}
else
{
Console.WriteLine("No");
}
}
}
}
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