Problem:
Score : 100 points

Problem Statement

There is a right triangle ABC with ∠ABC=90°.

Given the lengths of the three sides, |AB|,|BC| and |CA|, find the area of the right triangle ABC.

It is guaranteed that the area of the triangle ABC is an integer.

Constraints

1 \leq |AB|,|BC|,|CA| \leq 100

All values in input are integers.

The area of the triangle ABC is an integer.

Input

Input is given from Standard Input in the following format:

|AB| |BC| |CA|

Output

Print the area of the triangle ABC.

Sample Input 1

3 4 5

Sample Output 1

6

This triangle has an area of 6.

Sample Input 2

5 12 13

Sample Output 2

30

This triangle has an area of 30.

Sample Input 3

45 28 53

Sample Output 3

630

This triangle has an area of 630.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int l1 = sc.nextInt();
        int l2 = sc.nextInt();
        int l3 = sc.nextInt();
        int s = 0;

        if (Math.pow(l1, 2) == Math.pow(l2, 2) + Math.pow(l3, 2))
            s = (l2 * l3) / 2;
        else if (Math.pow(l2, 2) == Math.pow(l1, 2) + Math.pow(l3, 2))
            s = (l1 * l3) / 2;
        else
            s = (l2 * l1) / 2;

        System.out.println(s);
    }
}