TriangleArea

import java.util.Scanner;
public class TriangleArea {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        double a = Double.parseDouble(console.nextLine());
        double h = Double.parseDouble(console.nextLine());
        double area = ((a * h) / 2);
        System.out.printf("Triangle area = %.2f", area);
    }
}