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#include <iostream>
#include <cstdio>

using namespace std;

int main()
{
  ios::sync_with_stdio(false);
  
  size_t N;
  cin >> N;

  size_t* arr = new size_t[N];

  for (size_t i = 0 ; i < N ; ++i)
    cin >> arr[i];

  size_t count = 0;

  for (size_t i = 1 ; i < N ; ++i)
    {
      if (arr[i] > arr[i-1])
	continue;

      while (arr[i] <= arr[i-1])
	{
	  arr[i] *= 10;
	  ++count;
	  if ((arr[i-1] - arr[i]) < 9)
	    {
	      arr[i] = arr[i-1]+1;
	      break;
	    }
	}
    }

  cout << count;
  
  delete [] arr;
}