N=int(input())
A=";"+input().strip()+"["
ANS=0
for i in range(1,N+1):
    for j in range(N):
        if A[i-j]==A[i+j]:
            ANS+=1
        else:
            break
    for j in range(N):
        if A[i-j-1]==A[i+j]:
            ANS+=1
        else:
            break
print(ANS)