#pragma GCC optimize("O3") #include #define ll long long #define rep(i,n) for(ll i=0;i<(n);i++) #define pll pair #define pii pair #define pq priority_queue #define pb push_back #define eb emplace_back #define fi first #define se second #define endl '\n' #define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0); #define lb(c,x) distance(c.begin(),lower_bound(all(c),x)) #define ub(c,x) distance(c.begin(),upper_bound(all(c),x)) using namespace std; const ll INF=1e9; int main(){ ll a; cin >> a; for(ll n=1;n*n<=a;n++){ if(a>=n*(n+1)/2 && (a-n*(n+1)/2)%n==0){ cout << "YES" << endl; return 0; } if(a