#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef string str;
const ll mod = 1e9 + 7;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    str s;
    ll n, countt = 0;
    cin >> n >> s;
    str p;
    for (ll i = 0; i < s.size(); i++)
    {
        p = s[i];
        countt++;
        for (ll j = i + 1; j < s.size(); j++)
        {
            p += s[j];
            str r = p;
            reverse(r.begin(), r.end());
            if (r == p) countt++;
        }
    }
    cout << countt;
    return 0;
}