#include<stdio.h>
int main(){int n,i,j,k,f,ans=0;char s[502];scanf("%d%s",&n,s);for(i=0;i<n;i++){for(j=i;j<n;j++){f=1;for(k=0;i+k<=j;k++)if(s[i+k]!=s[j-k])f=0;ans+=f;}}printf("%d\n",ans);}