#include <iostream>
#include <algorithm>
#include <cassert>

using namespace std;

int main ()
{
    //freopen ("input", "r", stdin);
    //freopen ("output1", "w", stdout);

    int n;cin >> n;

    assert (1 <= n && n <= 1000000);

    long long sum = 0LL;
    for (int i = 1; i <= n; ++i)
    {
        int x;cin >> x;

        assert (1 <= x && x <= 1000000000);

        int cx = x, nr = 0;
        while (cx > 0)
        {
            nr = nr * 10 + cx % 10;
            cx /= 10;
        }

        if (x == nr) sum += 1LL * x;
    }
cout << sum << '\n';

    return 0;
}