Triangle Area

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Points: 3 (partial)
Time limit: 2.0s
Memory limit: 64M

Problem type

Alice has a right angled triangle with integer side lengths. Given the lengths of the three sides of the triangle, find the area of the triangle.

Input Specification

The first line will contain 3 integers, a, b, c (1 \le a, b, c \le 2 000), the three side lengths of the triangle.

It is guaranteed that the side lengths will form a valid right angle triangle.

Output Specification

Output the area of the triangle, rounded to the nearest integer.

Sample Input 1

12 13 5

Sample Output 1


Sample Input 2

25 24 7

Sample Output 2



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