#include<iostream>
#include<string>
#include<algorithm>
using namespace std;int n,a,c,i;main(){string s,t;cin>>n>>s;for(c=1;c<=n;c++)for(i=0;i+c<=n;i++){t=s.substr(i,c);reverse(t.begin(),t.end());if(i==s.find(t,i))a++;}cout<<a<<"\n";}