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

lld n, a[200000], m=0;

int main ()
{
	cin >> n;
	for (int i=0; i<n; ++i)
	{
		cin >> a[i];
	}
	for (int i=1; i<n; ++i)
	{
		while (a[i]<=a[i-1])
		{
           a[i]=(a[i]*10)+9;
		   m++;
		}
	}
	cout <<m;
	return 0;
}