#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define Rep(b, e, i) for(int i = b; i <= e; i++) #define Repr(e, b, i) for(int i = e; i >= b; i--) #define rep(n, i) Rep(0, n-1, i) #define repr(n, i) Repr(n-1, 0, i) #define all(v) (v).begin(), (v).end() #define pb(v) push_back(v) #define uniq(v) (v).erase(unique(all(v)),(v).end()) #define bitcnt(x) __builtin_popcount(x) #define fst first #define snd second #define Pqaz(T) priority_queue,greater> #define Pqza(T) priority_queue #define put(x) cout << x; #define putsp(x) cout << x << ' '; #define putbd cout << "---------------------------------------------" << endl; #define putln(x) cout << x << endl; #define debug(x) cerr << #x << "=" << x << endl; #define ENJYU std::ios::sync_with_stdio(false);std::cin.tie(0); typedef long long ll; typedef pair llP; typedef pair intP; typedef complex comp; typedef vector vec; typedef vector vecll; typedef vector vecd; typedef vector mat; typedef vector matll; typedef vector matd; //vector の中身を出力 template ostream &operator<<(ostream &o,const vector&v) {o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<> N; ll x = N/2, y = N-x; cout << (ll)(y+1)*x+y << endl; } int main(void){ solve(); //cout << "yui(*-v・)yui" << endl; return 0; }