The sum of the dividend, divisor, quotient and remainder is 77. Given that the quotient is 9 and the remainder is 4, find the dividend.
被除数、除数、商和余数的和是77，已知商是9，余数是4，求被除数．
<gadget id="calculator">77 - 4 - 9 - 4</gadget>
<output>60</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">54 + 4</gadget>
<output>58</output>

<result>58</result>