class MyVector3<T>
{
    public T x { get; set; }
    public T y { get; set; }
    public T z { get; set; }


    public static MyVector3<T> operator *(MyVector3<T> vec1, MyVector3<T> vec2)
    {
        return new MyVector3<T>(vec1.x * vec2.x, vec1.y * vec2.y, vec1.z * vec2.z);
    }
}

class MyVector3<T> where T : IComparable, IFormattable, IConvertible, IComparable<T>, IEquatable<T>

where

interface ISupportPlus<T>
{
   T Add(T other);
}

class Vector<T> where T : ISupportsPlus<T>
{
    T x, y, z;

    Vector<T> Add(Vector<T> other)
    {
        return new Vector<T>(x.Add(other.x), ...);
    }
}