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#include<bits/stdc++.h>

using namespace std;

int n;
long long w,a,b,c,l,p;

long long pt()
{
    long long ww = 1;
    for(int i = 0;i<min((int)c,9);++i)
    {
        ww *= 10;
    }
    return ww;
}

int main()
{
    scanf("%d", &n);
    scanf("%lld", &b);
    p = 1;
    for(int i = 1;i<n;++i)
    {
        scanf("%lld", &a);
        long long aa = a;
        while(a<b)
        {
            a *= 10;
            ++c;
            p = min(p*10,(long long)1000000000);
        }
        while(a>=b*10)
        {
            a /= 10;
            --c;
            p = pt();
        }
        if(a/10==b)
        {
            --c;
            p = pt();
        }
        if(a==b)
        {
            if(l+1<p)
            {
                ++l;
            }
            else
            {
                ++c;
                l = 0;
                p = min(p*10,(long long)1000000000);
            }
        }
        else
        {
            l = 0;
        }
        b = aa;
        w += c;
        //printf(" %d\n", w);
    }
    printf("%lld\n", w);
}