#include<cstdio>
char s[999];int c,n,d,a,i,j;main(){scanf("%d%s",&n,s);for(;++c<=n;)for(i=n;i--;a+=d==c)for(d=0,j=c;j--;)d+=s[i+j]==s[i+c-1-j];printf("%d\n",a);}