#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int N,osz=0,l=0,a,db=0;;
    cin>>N;
    int d[N];
    for (int i=1;i<=N;i++)
    {
        cin>>d[i];
        osz+=d*10*i;
    }
    int i=osz;
    do
    {
        l=0;
        i=osz-db;
        while (l!=2 || i!=0)
        {
            a=i%10;
            i=i/10;
            if (a!=0)
                l++;
        }
        i=osz-db;
        db++;

    }while (l!=1||l!=0);
    cout<<osz-i;
    return 0;
}