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#include <iostream>
using namespace std;
bool isless(string a, string b) {
    if(a.size() < b.size()) return 1;
    if(a.size() > b.size()) return 0;
    for(long long i = 0; i < a.size(); i++) {
        if(a[i] < b[i]) {
            return 1;
        }
        if(a[i] > b[i]) {
            return 0;
        }
    }
    return 1;
}
string add(string a, string b) {
   long long al = a.size()-1;
   long long bl = b.size()-1;
   long long carry = 0, temp, i;
   string result = "";
   while((al >= 0) && (bl >= 0)) {
        temp = (long long)(a[al] - '0') + (long long)(b[bl] - '0') + carry;
        carry = 0;
        if(temp > 9) {
            carry = 1;
            temp = temp - 10;
        }
        result += char(temp + '0');
        al--;
        bl--;
   }
   while(al >= 0) {
        temp = (long long)(a[al] - '0') + carry;
        carry = 0;
        if(temp > 9) {
            carry = 1;
            temp = temp % 10;
        }
        result += char(temp + '0');
        al--;
    }
   while(bl >= 0) {
        temp = (long long)(b[bl] - '0') + carry;
        carry = 0;
        if(temp > 9) {
            carry = 1;
            temp = temp % 10;
        }
        result += char(temp + '0');
        bl--;
    }
    if(carry) {
        result += "1";
    }
    string addition = "";
    for(i = result.size()-1; i >= 0; i--) {
        addition += result[i];
    }
    return addition;
}
int main() {
    ios::sync_with_stdio(false);
    long long n, i, x = 0;
    string pa, a, p, ao;
    cin >> n;
    cin >> p;
    for(i = 1; i < n; i++) {
        cin >> a;
        ao = a;
        pa = p.substr(0, a.size());
        if((pa == a) && (p.size() != a.size())) {
            a = add(p, "1");
            if(a.substr(0, pa.size()) != pa) {
                a = ao;
            }
        }
        while(isless(a, p)) {
            a += "0";
        }
        p = a;
        x += (a.size() - ao.size());
    }
    cout << x;
    return 0;
}