There is a balance and many weights of 13 grams and 17 grams. With these weights, what is the largest integer gram weight that cannot be weighed? (weights can only be placed on one side of the balance)
现有一架天平和很多个13克和17克的砝码，用这些砝码，不能称出的最大整数克重量是多少？(砝码只能放在天平的一边)
<gadget id="calculator">12 - 0</gadget>
<output>12</output>

<gadget id="calculator">17 * 12</gadget>
<output>204</output>

<gadget id="calculator">204 - 13</gadget>
<output>191</output>

<result>191</result>