Mr. Wang was born on February 29, 1976. According to regulations, male teachers must reach the age of 60 before retiring. How many birthdays did Mr. Wang have in total when he retires?
王老师是1976年2月29日出生的，按规定，男教师必须年满60周岁才能退休，到退休的时候，王老师一共过了多少个生日？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>