#include <iostream>
#include <cstring>
#include<fstream>
using namespace std;
#define MAX 1000000
//alg lui manacher

ifstream f ("pscpld.in");
ofstream g ("pscpld.out");
char sir[2*MAX+3],sir_fals[MAX+1];
int rasp[2*MAX+3];
long long cnt = 1,rasp_final;
int centru_palindrom,pozitie_maxima_palindrom;
int main()
{
    char c;
    f>>sir_fals;
    int l_fals = strlen(sir_fals);
    sir[0] = '#';
    for(int i = 0;i<l_fals;i++)
    {
        sir[cnt++] = sir_fals[i];
        sir[cnt++] = '#';
    }
    int l = strlen(sir);
    for(int i =0;i<l;i++)
    {
        int simetric_fata_de_centru_palindrom = centru_palindrom - (i-centru_palindrom);
        if(i<pozitie_maxima_palindrom)
        {
            rasp[i] = min(pozitie_maxima_palindrom-i,rasp[simetric_fata_de_centru_palindrom]);
        }
        while(i-1-rasp[i]>=0 && i +1+rasp[i]<l && sir[i+1+rasp[i]]==sir[i-1-rasp[i]])
            rasp[i]++;
        if(rasp[i]+i>pozitie_maxima_palindrom)
        {
            pozitie_maxima_palindrom = i+rasp[i];
            centru_palindrom = i;
        }
        rasp_final +=rasp[i]/2 + rasp[i]%2;
    }
    g << rasp_final;
}