Nezha has 100 cards, each marked with a natural number from 1 to 100. He gives the even-numbered cards to Ao Bing, and some of the odd-numbered cards to Taiyi Zhenren. The sum of the numbers on the remaining cards is exactly 2021. Nezha has at most cards left.
A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.