1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
#include <bits/stdc++.h>

using namespace std;

const long long MAX = 1223372036854775804;

long long cnt = 0;
int n = 0;
long long act, ex;

bool deb = 0;

int getExp(int num){
  long long pow10 = 1;
  long long a = 0;
  while(pow10 <= num){
    pow10 *= 10;
    a++;
  }
  if(a > 0)
    a--;
  return a;
}

//został przypadek gdy b jest prefiksem a i nie możemy dodać do niego więcej
//literek

int checkIf(long long a, long long b){ //sprawdza czy b jest prefiksem a
  long long m = 1;
  int pos = 0;
  while(a/m != b && a > 0 && m < (long long)(MAX)){
    m *= 10;
    pos++;
  }
  if(a/m == b)
    return pos;
  return -1;
}

void sol(){
  cin >> act;
  ex = 0;
  for(int a = 2; a <= n; a++){
    int num;
    cin >> num;
    int wyk1 = getExp(act);
    int wyk2 = getExp(num);
    int ex2 = 0;

    if(wyk1 + ex >= wyk2){
      ex2 = (wyk1 + ex) - wyk2;

      int exTemp;
      long long temp1 = act;
      long long temp2 = num;
      if(wyk1 > wyk2){
        exTemp = wyk1-wyk2;
        temp2 = num*(int)pow(10,exTemp);
      }
      else{
        exTemp = wyk2-wyk1;
        temp1 = act*(int)pow(10,exTemp);
      }

      if(deb){
        cout << "act: " << act << " ex: " << ex << " num: " << num << " ex2: " << ex2 << endl;
        cout << temp1 << " " << temp2 << endl;
      }

      if(temp1 >= temp2){
        int checkPos = checkIf(act,num);
        int revCheckPos = checkIf(num,act);
        if(deb)
          cout << "checkPos: " << checkPos << endl;
        long long z = 0;
        if(checkPos != -1 || revCheckPos != -1){

          z = temp1 - temp2;
          if(deb){
            cout << "temp1/2: " << temp1 << " " << temp2 << endl;
            cout << "z : " << z << endl;
          }
          if(ex2 < 10 && (z+1) < (long long)pow(10,ex2))
            z++;
          else{
            z = 0;
            ex2++;
          }

          int mn = getExp(z);
          if(deb)
            cout << "mn: " << mn << endl;
          num *= (long long)pow(10,(mn+1));
          num += z;
          ex2 -= (mn+1);
          cnt += (mn+1);

        }
        else{
          ex2++;
        }
      }
      cnt += ex2;
    }
    act = num;
    ex = ex2;
  }
  cout << cnt << endl;
}

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cin >> n;
  sol();
}