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#include<bits/stdc++.h>
using namespace std;
long long tab[200010];
long long pot[20]={1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000};
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	long long n,a,b,d,p,dl,pdl,sdl,s,w,i,j;
	cin>>n;
	for(i=1;i<=n;i++)
		cin>>tab[i];
	p=tab[1];
	dl=log10(p)+1;
	pdl=dl;
	sdl=0;
	s=0;
	w=0;
	for(i=2;i<=n;i++)
	{
		d=log10(tab[i])+1;
		//cout<<d<<"\n";
		if(d>dl)
		{
			p=tab[i];
			s=0;
			dl=d;
			pdl=d;
			sdl=0;
			continue;
		}
		for(j=1;j<=d;j++)
		{
			a=(tab[i]/pot[d-j])%10;
			if(j<=pdl)
				b=(p/pot[pdl-j])%10;
			else if(dl-sdl<j)
				b=(s/pot[dl-j])%10;
			else
				b=0;
			if(a<b)
			{
				//cout<<i<<" a<b\n";
				p=tab[i];
				s=0;
				dl++;
				pdl=d;
				sdl=0;
				break;
			}
			else if(a>b)
			{
				//cout<<i<<" a>b\n";
				p=tab[i];
				s=0;
				pdl=d;
				sdl=0;
				break;
			}
		}
		if(j>d)
		{
			if((dl-sdl<j)&&(s%pot[dl-j+1]==pot[dl-j+1]-1))
			{
				//cout<<i<<" jestem na sufiksie, same 9\n";
				p=tab[i];
				s=0;
				dl++;
				pdl=d;
				sdl=0;
			}
			else if((dl==pdl+sdl)&&(s==pot[sdl]-1))
			{
				if(p%pot[pdl-j+1]==pot[pdl-j+1]-1)//reszta z prefiksu to same 9
				{
					//cout<<i<<" jestem na prefiksie, same 9\n";
					p=tab[i];
					s=0;
					dl++;
					pdl=d;
					sdl=0;
				}
				else
				{
					//cout<<i<<" jestem na prefiksie, same 9 na sufiksie\n";
					p++;
					s=0;
					sdl=0;
				}
			}
			else
			{
				//cout<<i<<" zwiekszam sufiks o 1\n";
				s++;
				sdl=log10(s)+1;
			}
		}
		w+=dl-d;
	}
	cout<<w;
	return 0;
}