时间限制：C/C++/Rust/Pascal 2秒，其他语言4秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
题目描述
Amy asks Mr. B problem A. Please help Mr. B to solve the following problem.
Let Fi be fibonacci number.
F0 = 0, F1 = 1, Fi = Fi-1 + Fi-2
Given n and m, please calculate
As the answer might be very large, output it module 1000000000.
输入描述:
The first and only line contains two integers n, m(1 <= n <= 1000000000, 1 <= m <= 1000).
输出描述:
Output a single integer, the answer module 1000000000.