#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

#define lim 2000010
int d[lim],n,nr,mid,maxm;
char sir[lim];

int main()
{
    freopen("pscpld.in", "r", stdin);
    freopen("pscpld.out", "w", stdout);
    scanf("%s",sir+1);

    n=strlen(sir+1);
    nr=2*n;
    mid=0;
    maxm=0;
    long long sol=0;

    for (int i=n; i; i--)
    {
        sir[nr--]=sir[i];
        sir[nr--]='*';
    }
    n=2*n+1;
    sir[n]='*';

    for (int i=1; i<=n; i++)
    {
        if (i<=maxm) d[i] = min (maxm-i, d[2*mid-i]);
        while (i-d[i]>=2 && i+d[i]<=n-1 && sir[i-d[i]-1]==sir[i+d[i]+1]) d[i]++;
        if (i+d[i]>maxm)
        {
            mid=i;
            maxm=i+d[i];
        }
    }

    for (int i=1; i<=n; i++) sol += (d[i]+1)/2;
    printf("%lld",sol);

    return 0;
}