K is a natural number, and the formula ((700*701*...*2000)/(7**(K))) is an integer, find the maximum value of K.
K是自然数，且式子((700*701*…*2000)/(7**(K)))是整数，求K的最大值．
<gadget id="calculator">186 + 26 + 3</gadget>
<output>215</output>

<result>215</result>