lab2/ConsoleApp1/ConsoleApp5/Program.cs

int numOne = Convert.ToInt32(Console.ReadLine());
int numTwo = Convert.ToInt32(Console.ReadLine());
int numAnswer = Convert.ToInt32(Console.ReadLine());

if (numAnswer == numOne * numTwo)
{
    Console.WriteLine("YES");
}
else
{
    Console.WriteLine("NO");
}