#include using namespace std; #define incII(i, l, r) for(decay_t i = (l) ; i <= (r); i++) #define incIX(i, l, r) for(decay_t i = (l) ; i < (r); i++) #define incXI(i, l, r) for(decay_t i = (l) + 1; i <= (r); i++) #define incXX(i, l, r) for(decay_t i = (l) + 1; i < (r); i++) #define decII(i, l, r) for(decay_t i = (r) ; i >= (l); i--) #define decIX(i, l, r) for(decay_t i = (r) - 1; i >= (l); i--) #define decXI(i, l, r) for(decay_t i = (r) ; i > (l); i--) #define decXX(i, l, r) for(decay_t i = (r) - 1; i > (l); i--) #define inc(i, n) incIX(i, 0, n) #define dec(i, n) decIX(i, 0, n) #define inc1(i, n) incII(i, 1, n) #define dec1(i, n) decII(i, 1, n) auto inII = [](auto a, auto l, auto r) -> bool { return (l <= a && a <= r); }; auto inIX = [](auto a, auto l, auto r) -> bool { return (l <= a && a < r); }; auto inXI = [](auto a, auto l, auto r) -> bool { return (l < a && a <= r); }; auto inXX = [](auto a, auto l, auto r) -> bool { return (l < a && a < r); }; auto setmin = [](auto & a, auto b) -> bool { return (b < a ? a = b, true : false); }; auto setmax = [](auto & a, auto b) -> bool { return (b > a ? a = b, true : false); }; auto setmineq = [](auto & a, auto b) -> bool { return (b <= a ? a = b, true : false); }; auto setmaxeq = [](auto & a, auto b) -> bool { return (b >= a ? a = b, true : false); }; using LL = long long int; using LD = long double; #define PB push_back #define EB emplace_back #define MP make_pair #define MT make_tuple #define FI first #define SE second #define FR front() #define BA back() #define ALL(a) begin(a), end(a) #define RALL(a) rbegin(a), rend(a) #define RV(a) reverse(ALL(a)) #define ST(a) sort(ALL(a)) #define RST(a) sort(RALL(a)) #define SC static_cast #define SI(a) SC(a.size()) #define SL(a) SC(a.size()) #define RF(e, ...) for(auto && e: __VA_ARGS__) #define SF(a, ...) for(auto && [__VA_ARGS__]: a) #define until(e) while(not(e)) #define if_not(e) if(not(e)) #define ef else if #define UR assert(false) auto * IS = & cin; auto * OS = & cout; template void in(A & ... a) { (* IS >> ... >> a); } #define IN(...) __VA_ARGS__; in(__VA_ARGS__) struct OS_init { OS_init() { * OS << boolalpha << fixed << setprecision(20); } } os_init_; void out_([[maybe_unused]] string const & s) { } template void out_([[maybe_unused]] string const & s, A const & a) { * OS << a; } template void out_( string const & s, A const & a, B const & ... b) { * OS << a << s; out_(s, b ...); } auto outF = [](array const & s, auto const & ... a) { * OS << s[0]; out_(s[1], a ...); * OS << s[2] << flush; }; auto outN = [](auto const & ... a) { outF({ "", "" , "" }, a ...); }; auto outS = [](auto const & ... a) { outF({ "", " " , " " }, a ...); }; auto outL = [](auto const & ... a) { outF({ "", "\n", "\n" }, a ...); }; auto outSN = [](auto const & ... a) { outF({ "", " " , "" }, a ...); }; auto outNL = [](auto const & ... a) { outF({ "", "" , "\n" }, a ...); }; auto outSL = [](auto const & ... a) { outF({ "", " " , "\n" }, a ...); }; auto outD = [](auto const & ... a) { outF({ "[ ", " : " , " ]\n" }, a ...); }; auto out = outSL; template void disp_(A const & a) { * OS << a; } template void disp_(A const & a, string const & s, T const & ... t) { string ss; for(auto && e: a) { * OS << ss; ss = s; disp_(e, t ...); } } auto dispI = [](auto const & a, auto const & s, auto const & ... t) { disp_(a, t ...); * OS << s << flush; }; auto dispT = [](auto const & a, auto const & s, auto const & ... t) { for(auto && e: a) { disp_(e, t ...); * OS << s; } * OS << flush; }; auto dispL = [](auto const & a, auto const & ... t) { dispT(a, "\n", t ...); }; template istream & operator>>(istream & is, vector & v) { for(auto && e: v) { is >> e; } return is; } template ostream & operator<<(ostream & os, vector const & v) { string ss; for(auto && e: v) { os << ss << e; ss = " "; } return os; } template auto make_v(A a) { return a; } template auto make_v(A a, int n, M ... m) { return vector(n, make_v(a, m ...)); } template auto read_v(N ... n) { auto a = make_v(A { }, n ...); in(a); return a; } template istream & operator>>(istream & is, array & a) { for(auto && e: a) { is >> e; } return is; } template ostream & operator<<(ostream & os, array const & a) { string ss; for(auto && e: a) { os << ss << e; ss = " "; } return os; } template istream & operator>>(istream & is, pair & p) { return is >> p.first >> p.second; } template ostream & operator<<(ostream & os, pair const & p) { return os << p.first << " " << p.second; } template void tin_ (istream & is, T & t) { if constexpr(I < tuple_size::value) { is >> get(t); tin_(is, t); } } template void tout_(ostream & os, T const & t) { if constexpr(I < tuple_size::value) { if(I != 0) { os << " "; } os << get(t); tout_(os, t); } } template istream & operator>>(istream & is, tuple & t) { tin_ (is, t); return is; } template ostream & operator<<(ostream & os, tuple const & t) { tout_(os, t); return os; } // ---- ---- int main() { string IN(n); int ans = 0; inc1(i, 5) { int t = stoi("1" + string(i - 1, '0')); if(SI(n) > 3 * i) { ans += 9 * t; } ef(SI(n) == 3 * i) { auto x = n.substr(0, i); ans += stoi(x) - t + (x + x + x <= n ? 1 : 0); } else { break; } } out(ans); }