#include <bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    string s;
    int n;
    cin >> n >> s;
    long long countt = 0;
    int len = s.length();
    for (int i = 0; i < len; i++)
    {
        int l = i, r = i;
        while (l >= 0 && r < len && s[l] == s[r])
        {
            countt++;
            l--;
            r++;
        }
        l = i, r = i + 1;
        while (l >= 0 && r < len && s[l] == s[r])
        {
            countt++;
            l--;
            r++;
        }
    }
    cout << countt;
    return 0;
}