#include <bits/stdc++.h>

using namespace std;

using int64 = long long;
// const int mod = 1e9 + 7;
const int mod = 998244353;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

int main() {
  int N;
  cin >> N;
  int64 ret = 0;
  auto coef = make_v< int >(10, 10);
  for(int A = 1; A <= N; A++) {
    char x = to_string(A).front();
    char y = to_string(A).back();
    if(x == y) ret += x - '0' <= N;
    coef[y - '0'][x - '0']++;
  }
  string M = to_string(N);
  auto dp = make_v< int >(11, 10, M.size(), 2);
  fill_v(dp, -1);
  auto rec = MFP([&](auto rec, int first, int last, int idx, bool high) -> int {
    if(idx + 1 == M.size()) {
      return first == 10 && last <= (high ? M[idx] - '0' : 9);
    } else if(~dp[first][last][idx][high]) {
      return dp[first][last][idx][high];
    } else {
      int ans = 0;
      for(int i = 0; i <= (high ? M[idx] - '0' : 9); i++) {
        if(first < 10) {
          if(i == 0) ans += rec(first, last, idx + 1, high & (M[idx] - '0' == i));
          else if(i == first) ans += rec(10, last, idx + 1, high & (M[idx] - '0' == i));
        } else {
          ans += rec(first, last, idx + 1, high & (M[idx] - '0' == i));
        }
      }
      return dp[first][last][idx][high] = ans;
    }
  });


  for(int i = 1; i < 10; i++) {
    for(int j = 0; j < 10; j++) {
      ret += coef[i][j] * rec(i, j, 0, true);
    }
  }
  cout << ret << endl;
}

Measured memory_bytes: 256