时间限制：C/C++/Rust/Pascal 1秒，其他语言2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
Your friend has secretly picked N consecutive positive
integers between 1 and 100, and wants you to guess if their sum is even or odd.
If the sum must be even, output '
'. If the sum must be odd, output '
'. If the sum could be even or could be odd,
output '输入描述:
The input is a single integer N with.
输出描述:
Output a single word. The word should be '
'', according to the rules given earlier.