(追記) (追記ここまで)

29751번 - 삼각형 다국어

시간 제한	메모리 제한	제출	정답	맞힌 사람	정답 비율
0.1 초	1024 MB	9064	6174	5940	68.942%

문제

양의 정수 $W,ドル $H$가 주어진다. 밑변의 길이가 $W$이고, 높이가 $H$인 삼각형의 넓이를 구하시오.

입력

정수 $W,ドル $H$가 공백으로 구분되어 주어진다. $(1 \le W, H \le 100)$

출력

밑변의 길이가 $W$이고, 높이가 $H$인 삼각형의 넓이를 출력한다. 넓이는 항상 소수점 아래 첫 번째 자리까지 출력한다.

제한

예제 입력 1

1 1

예제 출력 1

0.5

예제 입력 2

2 3

예제 출력 2

3.0

힌트

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