#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll=long long; template using V = vector; template using P = pair; using vll = V; using vvll = V; #define ALL(v) v.begin(),v.end() template < class T > inline bool chmax(T& a, T b) {if (a < b) { a=b; return true; } return false; } template < class T > inline bool chmin(T& a, T b) {if (a > b) { a=b; return true; } return false; } #define DEBUG_VLL(vec) REP(sz, vec.size()) std::cerr<> a; for (ll i = 3; (i + 1) * i / 2 <= a; i++) { ll sss = (i + 1) * i / 2; ll rema = a - sss; if (rema % i == 0) { cout << "YES\n"; return 0; } } cout << "NO\n"; return 0; }