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#include <iostream>
#include <sstream>
using namespace std;
int n,x=0,d2=0,d3=0,dlug,dlug2;
int a[200000];
string l,m;
char z='0';
int main()
    {
         cin>>n;
    for(int q=0; q<n; q++)
    {
    cin>>a[q];
    dlug2=0;
    dlug=0;
    d2=0;
    while(a[q]<=a[q-1])
    {

ostringstream ss;
ss << a[q];
 l = ss.str();
 if(d2==0)
dlug=l.length();
ostringstream s;
s << d2;
m = s.str();

if(d2==0)
l=l+m;
d2++;
if(d2==9)
{
    d2=0;
l.replace(dlug,m.length()+1,"0"+m);
dlug2=l.length();
}
else
{
    l.replace(dlug,m.length(),m);
dlug2=l.length();
    a[q] = atoi(l.c_str());
}




        }
   x+=dlug2-dlug;
    }
cout<<x<<endl;
return(0);
}