题目描述

<span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">输入三角形的三条边</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">，</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">判断该三角形是否为直角三角形</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">，</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">若是直角三角形</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">，</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">则三角形的面积</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">；</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">若不为直角三角形</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">，</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">则输出</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">“</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">no</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">”。</span>

输入格式

<span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">前三行输入三条边长度(均为整数）</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">。</span>

输出格式

<span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">输出包括一行，直角三角形输出面积（只保留整数部分）</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">，</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">非直角三角形输出</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">“</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">no</span><span style="color:rgba(0,font-size:14px;font-family:"background-color:#FFFFFF;">”</span>

样例

样例 1

输入 # 1

3 
4 
5

输出 # 1

6