class Ulamek(x: Int, y: Int) {
	require(y != 0)

	private val g = gcd(x, y)
	val licznik : Int = x / g
	val mianownik : Int = y / g

  private def gcd(a: Int, b: Int) : Int =
		if (b == 0) a else gcd(b, a % b)

	override def toString =
		licznik + "/" + mianownik
}

def main() = {
		val f = new Ulamek(25, 100)
		println(f)
	}