import java.util.*;

public class Rational {
	Rational(int num, int denom) {
		this.num = num;
		this.denom = denom;
	}

	Rational(Rational r) {
		num = r.num;
		denom = r.denom;
		// alternatively... this(r.num, r.denom);
	}

	void multBy(Rational r) {
		num *= r.num;
		denom *= r.denom;
	}

	void copy(Rational r) {
		num = r.num;
		denom = r.denom;
	}

	public String toString() {return num + "/" + denom;}

	int num, denom;
}