Select some numbers from the 1994 numbers of 1, 2, ..., 1994, so that the sum of every two numbers in these numbers can be divisible by 26, then how many such numbers can be selected at most.
在1，2，…，1994这1994个数中选出一些数，使得这些数中的每两个数的和都能被26整除，那么这样的数最多能选出多少个．
<result>77</result>