#include<algorithm> #include<complex> #include<ctype.h> #include<iomanip> #include<iostream> #include<fstream> #include<map> #include<math.h> #include<numeric> #include<queue> #include<set> #include<stack> #include<stdio.h> #include<string> #include<string> #include<vector> using namespace std; typedef long long ll; #define FOR(i,a,b) for(ll i=(a);i<(b);++i) #define ALL(v) (v).begin(), (v).end() #define p(s) cout<<(s)<<endl #define p2(s, t) cout << (s) << " " << (t) << endl #define br() p("") #define pn(s) cout << (#s) << " " << (s) << endl #define p_yes() p("Yes") #define p_no() p("No") const ll mod = 1e9 + 7; const ll inf = 1e18; int main(){ cin.tie(0); ios::sync_with_stdio(false); // input ll N; cin >> N; if(N%2==0){ p(N+2); }else{ p(N+1); } return 0; }