class Number (n: Int) {
	val value = n;
	def unary_- () = new Number(-value)
	def + (q: Number) = new Number (value+q.value)
	def + (i: Int) = new Number (value+i)
	def - (q: Number) = this + (-q)
	def - (i: Int) = this + (- new Number(i))
	def * (q: Number) = new Number(value*q.value)
	def * (k: Int) = new Number (value*k)	
}

class Converter (x: Int) {
	def *(n: Number) = n * x
	def -(n: Number) = (-n) + x
	def +(n: Number) = (n)	+x
}

implicit def intToFactor(i: Int) = new Converter(i)

val a = new Number(1)
val b = new Number(9)
val c = new Number(-1)

val d = 2-(a+b)*(-(5*c+3))
println(d.value)