using static System.Console;

using static System.Convert;

using System.Numerics;

using System.Globalization;

public class Program {

    public static void Main() {

        var hex = "E365A931A000000";

        WriteLine(ToInt64(hex, 16));

        hex = "E365A931";

        WriteLine(ToInt32(hex, 16));

        hex = "E365A931A000000000";

        WriteLine(BigInteger.Parse(hex, NumberStyles.HexNumber));

    }

}