public static void Main(string[] args)
{
int[] arr1, arr2;
int n;
if (!Polynom.TryParsePolynom(Console.ReadLine(), out arr1) ||
!Polynom.TryParsePolynom(Console.ReadLine(), out arr2) ||
!int.TryParse(Console.ReadLine(), out n))
{
Console.WriteLine("Incorrect input");
return;
}
Console.WriteLine(Polynom.PolynomToString(Polynom.Sum(arr1, arr2)));
Console.WriteLine(Polynom.PolynomToString(Polynom.Dif(arr1, arr2)));
Console.WriteLine(Polynom.PolynomToString(Polynom.MultiplyByNumber(arr1, n)));
Console.WriteLine(Polynom.PolynomToString(Polynom.MultiplyByPolynom(arr1, arr2)));
}