Xiaoliang filled a glass of drink, first drank (1/6) of this drink, filled it with water and drank (1/3), then filled it with water and drank (1/2), and finally put I drank a glass of water. How many glasses of water did Xiao Liang drink?
小亮倒满了一杯饮料，先喝了这杯饮料的(1/6)，加满水后又喝了(1/3)，再倒满水后又喝了(1/2)，最后把一杯水都喝了．小亮共喝了多少杯水？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/6) + (1/3) + (1/2)</gadget>
<output>1</output>

<result>1</result>