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#pragma GCC optimize("O3")
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// using namespace __gnu_pbds;
// gp_hash_table<int, int> mapka;

using namespace std;
#define PB push_back
#define MP make_pair
#define LL long long
#define int LL
#define FOR(i,a,b) for(int i = (a); i <= (b); i++)
#define RE(i,n) FOR(i,1,n)
#define REP(i,n) FOR(i,0,(int)(n)-1)
#define R(i,n) REP(i,n)
#define VI vector<int>
#define PII pair<int,int>
#define LD long double
#define FI first
#define SE second
#define st FI
#define nd SE
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())

template<class C> void mini(C &a4, C b4) { a4 = min(a4, b4); }
template<class C> void maxi(C &a4, C b4) { a4 = max(a4, b4); }

template<class TH> void _dbg(const char *sdbg, TH h){ cerr<<sdbg<<'='<<h<<endl; }
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a) {
  while(*sdbg!=',')cerr<<*sdbg++;
  cerr<<'='<<h<<','; _dbg(sdbg+1, a...);
}

template<class T> ostream &operator<<(ostream& os, vector<T> V) {
  os << "["; for (auto vv : V) os << vv << ","; return os << "]";
}
template<class L, class R> ostream &operator<<(ostream &os, pair<L,R> P) {
  return os << "(" << P.st << "," << P.nd << ")";
}

#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (__VA_ARGS__)
#define cerr if(0)cout
#endif

int n;
vector<int> pob(){
  string pom;
  cin >> pom;
  vector<int> res;
  for(char &el:pom){
    res.PB(el - '0');
  }
  return res;
}
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout << fixed << setprecision(11);
  cerr << fixed << setprecision(6);
  cin >> n;
  vector<int> ak = pob();
  int res = 0;
  R(_,n - 1){
    int i = SZ(ak) - 1;
    while(ak[i] == 9){
      ak[i] = 0;
      i--;
      if(i == -1){
        ak.PB(0);
        i = 0;
      }
    }
    ak[i]++;
    vector<int> pom = pob();
    res -= SZ(pom);
    if(SZ(pom) > SZ(ak)){
      swap(pom,ak);
    }else{
      R(j,SZ(pom)){
        if(pom[j] != ak[j]){
          if(pom[j] < ak[j]){
            ak.PB(0);
          }
          int ile = min(11ll, SZ(ak));
          R(k,ile){
            ak[SZ(ak) - k - 1] = 0;
          }
          R(k,ile){
            if(k < SZ(pom)){
              ak[k] = pom[k];
            }else
              ak[k] = 0;
          }
          break;
        }
      }
    }
    res += SZ(ak);
  }
  cout << res << "\n";
}