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#include <iostream>

using namespace std;



void renorm(int64_t &b, int &kb){
    for (int j=0; b<100000000000000000ll && kb>0; j++){
        b*=10;
        kb--;
    }
}

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

    int n;
    int64_t acc=0;
    int64_t b;
    int kb;

    cin >>n;

    cin>>b;
    kb = 0;

    for (int i=1; i<n;i++) {
        int64_t a,k;
        cin>>a;

        int64_t dziel=1;
        b++;
        int64_t  bb = b;
        k=kb;
        while (a<bb) {
            bb /=10;
            k++;
            dziel*=10;
        }

        acc += k;

        if (a>bb){
            b=a;
            kb=k;
            renorm(b,kb);
        }

    }
    cout<<acc<<endl;

    return 0;
}