Calculate how much 264+451-216+136-184+149=.
计算264+451-216+136-184+149=多少．
<gadget id="calculator">451 - 216</gadget>
<output>235</output>

<gadget id="calculator">136 - 184</gadget>
<output>-48</output>

<gadget id="calculator">264 + 235 + (-48) + 149</gadget>
<output>600</output>

<result>600</result>