Among the 50 natural numbers from 1 to 50, how many different methods are there to add two numbers to make their sum greater than 50?
从1到50这50个自然数中，取两个数相加，要使它们的和大于50，共有多少种不同的取法．
<gadget id="calculator">1 + 49</gadget>
<output>50</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">50 * (25/2)</gadget>
<output>625</output>

<result>625</result>