#include <bits/stdc++.h>
using namespace std;
int main(){int N,a=0;string S;cin>>N>>S;for(int i=0;i<N;i++)for(int j=1;j<=N-i;j++){string U,T=S.substr(i,j);U=T;reverse(U.begin(),U.end());a+=T==U;}cout<<a<<'\n';}