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// Example program
#include <iostream>
#include <string>
#include <math.h>

int main()
        {
            unsigned long long prev = 0;
            unsigned long long counter = 0;
            int n;
            
            std::cin >> n;

            while (n-- > 0)
            {
                unsigned long long c;
                std::cin >> c;

                if (c <= prev)
                {
                    auto zc = (int)log10(prev) - (int)log10(c);
                    auto padV = c * (unsigned long long) pow10(zc);
                    if (padV > prev)
                    {
                        prev = padV;
                        counter += zc;
                    }
                    else if (zc > 0 && ( (int)log10(prev - padV + 1)) < zc)
                    {
                        prev = prev + 1;
                        counter += zc;
                    }
                    else
                    {
                        prev = padV * 10;
                        counter += zc + 1;
                    }
                }
                else
                {
                    prev = c;
                }
            }
            std::cout << counter;
        return 0;
    }