/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/
#include<bits/stdc++.h>
#include <iostream>

using namespace std;

string s;
vector<vector<int>> dp;

bool rec(int i,int j){
    if(i>=j){
        return true;
    }
    if(dp[i][j]!=-1){
        return dp[i][j];
    }
    if(s[i]!=s[j]){
        return dp[i][j]=false;
    }else{
        return dp[i][j]=rec(i+1,j-1);
    }
}

int main()
{
    int n;
    cin>>n;
    cin>>s;
    int ans=0;
    dp.resize(n,vector<int>(n,-1));
    for(int i=0;i<n;i++){
        for(int j=i;j<n;j++){
            ans+=rec(i,j);
        }
    }
    cout<<ans<<endl;
    
    return 0;
}