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#include<bits/stdc++.h>
using namespace std;

#define int long long

#define PB push_back
#define MP make_pair
#define FI first
#define SE second
#define ST FI
#define ND SE
#define SZ(x) ((int)(x).size())

#define ALL(it, x) for(__typeof(x.begin()) it = x.begin(); it != x.end(); it++)
#define REP(i, x) for (int i = 0; i < x; i++)
#define FOR(i, x) for (int i = 1; i <= x; i++)
#define BACK(i, x) for (int i = x; i; i--)

typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<VI> VVI;

template<typename TH> void _dbg(const char* s, TH h) { cerr<<s<<"="<<h<<"\n"; }
template<typename TH, typename... TA> void _dbg(const char* s, TH h, TA... t) {
  while(*s != ',') {cerr<<*s++;} cerr<<"="<<h<<","; _dbg(s+1, t...);
}
#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#define debugv(x) {{cerr <<#x <<" = "; ALL(itt, (x)) cerr <<*itt <<", "; cerr <<"\n"; }}
#else
#define debug(...) (__VA_ARGS__)
#define debugv(x)
#define cerr if(0)cout
#endif

const int MN = 200 * 1000 + 50;   //!!!!!!!!!!!!!!!!
//const int MN = 50;   //!!!!!!!!!!!!!!!!
int n, res = 0, ndig = 0, nzpref = 1, nzsuf = 0;
vector<int> dig;


int take_digit(int b, int nb, int i) {
  return (int)(b / pow(10, nb - 1 - i)) % 10;
}

void set_zeros(int b, int e) {
  for(int i = max(0ll, b); i < e && i < ndig; i++) {
    dig[i] = 0;
  }
}

void set_zeros_from(int nb) {
  set_zeros(nb, nzpref);
  nzpref = nb;

  set_zeros(ndig - nzsuf, ndig);
  nzsuf = 0;
}

void extend() {
  dig[ndig] = 0;
  ndig++;
}

void update_nzsuf(int i) {
  if (i + 1 + nzsuf == ndig && i >= nzpref) {
    nzsuf++;
  }
}

bool maybe_add_one(int nb) {
  if (nb >= ndig) return false;
  
  dig[ndig - 1]++;
  update_nzsuf(ndig - 1);
  for (int i = ndig - 1; i >= nb + 1; i--) {
    if (dig[i] >= 10) {
      dig[i] -= 10;
      dig[i - 1] += 1;
      update_nzsuf(i - 1);
   }
    else {
      break;
    }
  }

  if (dig[nb] >= 10) {
    dig[nb] = 0;
    return false;
  }

  return true;
}

int process(int b) {
  int nb = log10(b) + 1;

  debug(nb);
  if (nb > ndig) {
    ndig = nb;
    nzpref = nb;
    nzsuf = 0;

    for (int i = 0; i < nb; i++) {
      dig[i] = take_digit(b, nb, i);
    }
    return 0;
  }

  int d;
  int sgn = 0;
  REP(i, nb) {
    d = take_digit(b, nb, i);
    if (sgn == 0) {
      if (d > dig[i])
        sgn = 1;
      if (d < dig[i])
        sgn = -1;
    }

    dig[i] = d;
    nzpref = max(nzpref, i+1);
  }
  debug(sgn);

  if (sgn == 1) {
    set_zeros_from(nb);
    return ndig - nb;
  }
  else if (sgn == 0) {
    //add one and carry one, and maybe extend
    if (maybe_add_one(nb)) {
      return ndig - nb;
    }
    else {
      set_zeros_from(nb);
      extend();
      return ndig - nb;
    }
  }
  else {
    set_zeros_from(nb);
    extend();
    return ndig - nb;
  }

  return 0;
}

int32_t main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout << setprecision(7) << fixed;  
  int b;

  cin >> n;
  dig.resize(MN);
  REP(i, n) {
    cin >> b;
    int r = process(b);
    debug(b);
    //debugv(dig);
    debug(r, ndig, nzpref, nzsuf);
    res += r;
  }
  

  cout << res << endl;
  return 0;
}