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#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    long long ile = 0;
    unsigned long long a[n];
    for(int i = 0; i<n; i++)
        cin >> a[i];
    for(int i = 1; i<n; i++) {
        while(a[i]<a[i-1]) {
            a[i] *= 10;
            ile++;
        }
    }
    cout << ile << endl;
    return 0;
}