N=int(input())
S=input()
a=0
for i in range(N):
 for j in range(i+1,N+1):
  T=S[i:j]
  L=len(T)
  f=1
  for k in range(L):
   if T[k]!=T[-k-1]:
    f=0
  a+=f
print(a)