There are 422 sheep and 279 goats on the grassland, and 124 sheep ran away. How many sheep are there in total?
草原上有绵羊422只，山羊279只，跑了124只绵羊，一共还有多少只羊？
<gadget id="calculator">279 - 124</gadget>
<output>155</output>

<gadget id="calculator">422 + 155</gadget>
<output>577</output>

<result>577</result>