On a certain day, there is a difference of 7°C between the highest temperature and the lowest temperature in Hangzhou. If the lowest temperature of the day is -1°C, what is the highest temperature in °C?
某日，杭州市最高气温和最低气温相差7℃，如果当天最低气温为-1℃，那么最高气温是多少℃．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<result>6</result>