75 人解决，120 人已尝试。
96 份提交通过，共有 362 份提交。
4.4 EMB 奖励。
单点时限: 2.0 sec
内存限制: 256 MB
You enjoy working with numbers that contain only square digits (namely, 0, 1, 4 and 9). The sequence containing only these digits is 0, 1, 4, 9, 10, 11, 14… output the N-th term (indexed from 0) in this sequence.
There are several test cases,each test case contain only a integer N(0<=N<=2^31-1).
output the N-th term (indexed from 0) in this sequence.
16 123
100 1949