"Hammer, scissors, paper" is a two-player game. The rules of the game are as follows: "paper" wins "hammer" and gets 5 points, "hammer" wins "scissors" gets 4 points, "scissors" wins "paper" gets 3 points ． When Xiaohua and Xiaojun were playing this game, Xiaohua won 10 times and scored 38 points, of which "scissors" won "cloth" 5 times. You are smart, do the math, how many times Xiaohua "cloth" won "hammer".
"锤子、剪刀、布"是一种两人游戏，游戏规则约定："布"赢"锤子"得5分，"锤子"赢"剪刀"得4分，"剪刀"赢"布"得3分．小华和小军在玩这个游戏时，小华赢了10次，得38分，其中"剪刀"赢"布"5次．聪明的你算一算，小华"布"赢"锤子"多少次．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">38 - 15 - 20</gadget>
<output>3</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<result>3</result>