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#include <stdio.h>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

typedef vector<int> VI;
typedef long long LL;
typedef pair<int,int> para;

#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define PB push_back
#define ST first
#define ND second
#define MP make_pair


int main() {
  int n, i, c, la, lb, j;
  long m=0;
  LL v=1, t[21], a=1, b;
  string sa, sb;

  REP(i,20) {
    t[i]=v;
//    cout<<i<<" "<<v<<endl;
    v*=10;
  }

  scanf("%d", &n);

  for (i=0;i<n;i++) {
    scanf("%d", &c);
    b=c;
//cout<<b<<"  ";

    for (j=0; (b+1)*t[j]<=a+1; j++) ;
    m+=j;
    a= (b*t[j]>a ? b*t[j] : a+1);
//cout<<a<<endl;

  }

//  printf("%l\n", m);
  cout<<m<<endl;
  return 0;
}