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#include<bits/stdc++.h>
#define ull unsigned long long
#define pb push_back
#define MP make_pair

using namespace std;

const ull M = 2e5 + 2137;
const ull graniczna = 1e15;

ull a[M];
ull ile_cyfr[M];

int policz(ull n){
	int cnt = 0;
	while(n > 0){
		n /= 10;
		cnt++;
	}
	return cnt;
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int N;
	cin >> N;
	for(int i = 0; i < N; i++){
        cin >> a[i];
        int tmp = a[i], cnt = 1;
        while((tmp /= 10) > 0) cnt++;
        ile_cyfr[i] = cnt;
	}

    ull wyn = 0;
    for(int i = 1; i < N; i++){
        //cout << "Patrze na " << a[i] << endl;
        if(a[i - 1] >= graniczna){
            int roznica = policz(a[i-1]) - ile_cyfr[i];
            int r = roznica;
			int prawr = ile_cyfr[i - 1] - ile_cyfr[i];

            ull tmp = a[i - 1], ogon = 0, pot = 1;
            while(roznica--){
                ogon += (tmp % 10) * pot;
                pot *= 10;
                tmp /= 10;
            }
			//cout << "Teraz porownuje " << tmp << " z " << a[i] << endl;
            if(tmp < a[i]){
                wyn += prawr;
                ile_cyfr[i] += prawr;
                while(r--) a[i] *= 10;
            }
			else if(tmp > a[i]){
                prawr++;
                wyn += prawr;
                ile_cyfr[i] += prawr;
                while(r--) a[i] *= 10;
			}
            else{
                wyn += prawr;
               	ile_cyfr[i] += prawr;
				a[i] = a[i - 1];
            	//while(r--) a[i] *= 10;
            }
        }
        else if(a[i - 1] >= a[i]){
            int roznica = ile_cyfr[i - 1] - ile_cyfr[i];
            int r = roznica;
            ull tmp = a[i - 1], ogon = 0, pot = 1;
            while(roznica--){
                ogon += (tmp % 10) * pot;
                pot *= 10;
                tmp /= 10;
            }

            //cout << "Porownuje " << tmp << " + " << ogon << " z liczba " << a[i] << endl;

            if(tmp < a[i]){
                wyn += r;
                ile_cyfr[i] += r;
                while(r--) a[i] *= 10;
            }
            else if(tmp > a[i]){
                r++;				
                wyn += r;
                ile_cyfr[i] += r;
                while(r--) a[i] *= 10;
            }
            else{
                ull pom9 = 0;
                int pomr = r;
                while(pomr--){
					pom9 *= 10;
					pom9 += 9;
				}
                if(r > 0 && ogon < pom9){
                    wyn += r;
                    ile_cyfr[i] += r;
                    while(r--) a[i] *= 10;
                    a[i] += ogon + 1;
                }
                else{
                    r++;
                    wyn += r;
                    ile_cyfr[i] += r;
                    while(r--) a[i] *= 10;
                }
            }
        }
        //cout << "a[" << i << "] wynosi " << a[i] << endl;
    }

    cout << wyn;
	return 0;
}