#include <iostream>
using namespace std;
int main()
{long long n,s=0,ultimacifra,nr,inv=0;
cin>>n;
    while(n!=0){
           cin>>nr;
    if(nr<10 && nr>-10)
        nr=0;
    else{
        ultimacifra=nr%10;
        while(nr!=0){
            if(nr%10!=ultimacifra)
                inv=inv*10+nr%10;
            nr=nr/10;

        }
        while(inv!=0){
            nr=nr*10+inv%10;
            inv=inv/10;
        }
        }
        s=s+nr;
        n--;
    }
    cout<<s;
    return 0;
}