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#include "cstdio"
#include "cstring"

// #define D
#define MAX 12
#define MAXL 1000000000
#define lli long long int
int n;
lli r, tr;
lli is, t, im;
int ls, lm, e, f, i;

int dl(lli v)
{
	if(v > 999999999)
		return 10;
	if(v > 99999999)
		return 8;
	if(v > 9999999)
		return 8;
	if(v > 999999)
		return 7;
	if(v > 99999)
		return 6;
	if(v > 9999)
		return 5;
	if(v > 999)
		return 4;
	if(v > 99)
		return 3;
	if(v > 9)
		return 2;
	return 1;
}
int rdl(int l)
{
	if(l == 5)
		return 100000;
	if(l == 4)
		return 10000;
	if(l == 3)
		return 1000;
	if(l == 2)
		return 100;
	if(l == 1)
		return 10;
	if(l == 0)
		return 1;
	return 1000000;
}

void step(lli &i, int &l)
{
	++l;
	lli t = i * 10;
	if(t <= MAXL)
	{
		i = t;
	}
}

int main()
{
	r = 0;
	scanf("%d", &n);
	scanf("%lld", &im);
	lm = dl(im);
	e = 0;
	f = rdl(lm);
	#ifdef D
		printf("\t# m(%6d) %-10lld\n", lm, im);
	#endif

	while(--n)
	{
		scanf("%lld", &is);
		ls = dl(is);
		tr = 0;
		#ifdef D
			printf("#%d", n);
			printf("\tR m(%6d) %-10lld\n\t: s(%6d) %-10lld\n", lm, im, ls, is);
		#endif

		if(lm < 11)
		{
			#ifdef D
				puts("\t -> lm < 11");
			#endif
			while(ls < lm)
			{
				step(is, ls);
				++tr;
			}

			#ifdef D
				puts("\t while step");
				printf("\t# m(%6d) %-10lld\n\t: s(%6d) %-10lld\n", lm, im, ls, is);
			#endif
			if(is > im)
			{
				im = is;
				lm = ls;
			}
			else
			{
				//check
				#ifdef D
					printf("\t# tr = %lld (%d == %d)\n", tr, dl(im+1), lm);
				#endif
				t = rdl(tr);
				if(tr && (im + 1 < im - im % t + t))
				{
					is = ++im;
				}
				else
				{
					step(is, ls);
					++tr;
					lm = ls;
					im = is;
				}
			}
		}
		else
		{

			if(ls > lm)
			{
				lm = ls;
				im = is;
				e = 0;
				f = rdl(lm);
			}
			else
			{
				while(ls < lm)
				{
					step(is, ls);
					++tr;
				}
				if(is > im)
				{
					im = is;
				}
				else
				{
					if(tr && ((e+1) < f))
					{
						++e;
					}
					else
					{
						step(is, ls);
						++tr;
						lm = ls;
						im = is;
					}
				}
			}
		}
		#ifdef D
			printf("\tE m(%6d) %-10lld\n\t: s(%6d) %-10lld\n", lm, im, ls, is);
			printf("\t# r = %lld + %lld\n", r, tr);
		#endif
		r += tr;
	}
	printf("%lld\n", r);
	return 0;
}