ABC102A - Multiple of 2 and N
#include <iostream> using namespace std; int GCD(int a, int b){ return b? GCD(b, a % b) : a; } int LCM(int a, int b) { return a * b / GCD(a, b); } int main(void) { int n; cin.tie(0); ios::sync_with_stdio(false); cin >> n; cout << LCM(n, 2) << "\n"; return 0; }