#include <fstream>

using namespace std;
ifstream fin("parola.in");
ofstream fout("parola.out");
int main()
{
    int k, pass=0;
    long long a, b, ca;
    fin>>k;
    fin>>a>>b;
    ca = a;
    while(ca>9)
        ca = ca - ca/10;
    pass = pass*10 + ca;
    pass = pass + b%10;
    while(a>0)
    {
        pass = pass + a%10;
        a = a/10;
    }
    while(b>0)
    {
        pass = pass + b%10;
        b = b/10;
    }
    fout<<pass;
    return 0;
}