Please think of a number, add 5 to it, multiply the result by 2, subtract 4, divide the difference by 2, then subtract the number you originally thought of, what is the final calculation result.
请你想好一个数，将它加上5，其结果乘以2，再减去4，得到的差除以2，再减去你最初想好的那个数，最后的计算结果是多少．
<result>3</result>