The construction of a road started on February 15th this year and will be completed on June 30th this year. How many days is the total construction period?
修一条公路，今年2月15日开工，将在今年的6月30日完工，工期一共是多少天．
<gadget id="calculator">28 - 15</gadget>
<output>13</output>

<gadget id="calculator">13 + 1</gadget>
<output>14</output>

<gadget id="calculator">14 + 31 + 30 + 31 + 30</gadget>
<output>136</output>

<result>136</result>