class Vector
        declare x
        declare y

        def Vector(x, y)
                this.x = float(x)
                this.y = float(y)
        end

        def operator+(other)
                return new(Vector, this.x + other.x, this.y + other.y)
        end

        def operator-(other)
                return new(Vector, this.x - other.x, this.y - other.y)
        end

        def operator/(val)
                return new(Vector, this.x / val, this.y / val)
        end

        def operator*(val)
                return new(Vector, this.x * val, this.y * val)
        end

        def toString()
                return format("[%s, %s]", this.x, this.y)
        end
end

println new(Vector, 5, 7) + new(Vector, 2, 3)
println new(Vector, 5, 7) - new(Vector, 2, 3)
println new(Vector, 5, 7) * 11
println new(Vector, 5, 7) / 2