/* -*- coding: utf-8 -*- * * 192.cc: No.192 合成数 - yukicoder */ #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<iostream> #include<string> #include<vector> #include<map> #include<set> #include<stack> #include<list> #include<queue> #include<deque> #include<algorithm> #include<numeric> #include<utility> #include<complex> #include<functional> using namespace std; /* constant */ /* typedef */ /* global variables */ /* subroutines */ /* main */ int main() { int n; cin >> n; printf("%d\n", (n & 1) ? n - 1 : n); return 0; }