#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;
    int n, countt = 0;
    cin >> n >> s;
    for (int i = 0; i < n; i++)
    {
        int l = i, r = i;
        while (l >= 0 && r < n && s[l] == s[r])
        {
            countt++;
            l--;
            r++;
        }
        l = i, r = i + 1;
        while (l >= 0 && r < n && s[l] == s[r])
        {
            countt++;
            l--;
            r++;
        }
    }
    cout << countt;
    return 0;
}