#import"bits/stdc++.h"
int N,a,i,j,k,t=1;char S[500];main(){std::cin>>N;for(int x=0;x<N;x++)std::cin>>S[x];for(;i<N;k=j=++i,t=1)for(;j<N;k=++j,t=1){for(;k>=i;--k)t&=S[k]==S[j-k+i];a+=t;}printf("%d\n",a);}