This year is 1997, the sum of the ages of the parents (integer) is 78 years old, and the sum of the ages of the siblings (integer) is 17 years old. Four years later, the age of the father is four times the age of the younger brother, and the age of the mother is equal to the age of the older sister. 3 times, then when the age of the father is 3 times the age of the sister, how many years is it in AD.
今年是1997年，父母的年龄(整数)和是78岁，姐弟的年龄(整数)和是17岁，四年后父的年龄是弟的年龄的4倍，母的年龄是姐的年龄的3倍，那么当父的年龄是姐的年龄的3倍时是公元多少年．
<gadget id="calculator">17 + 4 + 4</gadget>
<output>25</output>

<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">78 + 4 + 4</gadget>
<output>86</output>

<gadget id="calculator">100 - 86</gadget>
<output>14</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

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

<gadget id="calculator">25 - 14</gadget>
<output>11</output>

<gadget id="calculator">11 * 4</gadget>
<output>44</output>

<gadget id="calculator">44 - 4</gadget>
<output>40</output>

<gadget id="calculator">14 - 4</gadget>
<output>10</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">1_997 + 5</gadget>
<output>2_002</output>

<result>2_002</result>