The fruit shop brings back a batch of apples, the salesperson takes out 1 kg of apples, and divides the remaining apples into 6 equal parts. The first customer buys one portion and 1 kg, and the salesperson takes out 1 kg of the remaining apples. The remaining apples are divided into 6 shares on average, and the second customer buys one of them and 1 kilogram; the salesperson takes out 1 kilogram of the remaining apples, and the remaining apples are divided into 6 shares on average, and the third customer buys one of them and 1 kilogram; the salesperson took out 1 kilogram of the remaining apples again, and divided the remaining apples into 6 parts on average.
水果店运回一批苹果，售货员把这批苹果拿出1千克，余下的平均分成6份，第一位顾客买走其中的一份和1千克，售货员把剩下的苹果拿出1千克，余下的平均分成6分，第二位顾客买走其中的一份和1千克；售货员又把剩下的苹果拿出1千克，余下的平均分成6份，第三位顾客买走其中的一份和1千克；售货员再次把剩下的苹果拿出1千克，余下的平均分成6份，第四位顾客买走其中的一份和1千克，最后剩下的苹果至少是多少千克．
<gadget id="calculator">6 ** 4</gadget>
<output>1_296</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">1_296 - 5</gadget>
<output>1_291</output>

<gadget id="calculator">1_291 + 5</gadget>
<output>1_296</output>

<gadget id="calculator">1_296 / 6</gadget>
<output>216</output>

<gadget id="calculator">1_291 - 216 - 1</gadget>
<output>1_074</output>

<gadget id="calculator">1_074 / 6</gadget>
<output>179</output>

<gadget id="calculator">179 + 1</gadget>
<output>180</output>

<gadget id="calculator">1_291 - 216 - 180 - 1</gadget>
<output>894</output>

<gadget id="calculator">894 / 6</gadget>
<output>149</output>

<gadget id="calculator">149 + 1</gadget>
<output>150</output>

<gadget id="calculator">1_291 - 216 - 180 - 150 - 1</gadget>
<output>744</output>

<gadget id="calculator">744 / 6</gadget>
<output>124</output>

<gadget id="calculator">124 + 1</gadget>
<output>125</output>

<gadget id="calculator">1_291 - 216 - 180 - 150 - 125</gadget>
<output>620</output>

<result>620</result>