#pragma region Macros #include using namespace std; using namespace __gnu_pbds; // using namespace __gnu_cxx; #define TO_STRING(var) # var #define pb emplace_back #define int ll #define endl '\n' using ll = long long; using ld = long double; const ld PI = acos(-1); const ld EPS = 1e-10; const int INF = 1 << 30; const ll INFL = 1LL << 62; // const int MOD = 998244353; const int MOD = 1000000007; int ceil(int x, int y) {return (x > 0 ? (x + y - 1) / y : x / y);} int POW(int x, int y) { if (y != (int)(y) or y < 0 or x != 0 && x != 1 && y > 64) {cout << "Error" << endl;return 0;} if (y == 0) return 1; if (y % 2 == 0) return POW(x * x, y / 2); return x * POW(x, y - 1); } __attribute__((constructor)) void constructor() { ios::sync_with_stdio(false); cin.tie(nullptr); cout << fixed << setprecision(15); } #pragma endregion signed main(){ int N; cin >> N; int cnt = 1; int cur = 1; while (true) { if (cur == N) { cout << cnt << endl; break; } if (cur + __builtin_popcountll(cur) <= N) { cur += __builtin_popcountll(cur); cnt++; } else if (cur - __builtin_popcountll(cur) >= 1) { cur -= __builtin_popcountll(cur); cnt++; } else { cout << -1 << endl; break; } if (cnt >= 10000) { cout << -1 << endl; break; } } }