Among the 50 natural numbers from 1 to 50, how many ways are there to take two different numbers so that their sum is a multiple of 4?
在1到50这50个自然数中，取出两个不同的数，使它们的和是4的倍数，一共有多少种取法？
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">12 * 13</gadget>
<output>156</output>

<gadget id="calculator">11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 + 156 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1</gadget>
<output>300</output>

<result>300</result>