#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

char cuv[2000010];
int lp[2000010];
int centru=2,dr=1,lgmax,contor,lg,og,dif;
long long suma=1;

void citire()
{
    cin.getline(cuv,1000005);
    lg=strlen(cuv);
    contor=lg;
    lg=2*lg+1;
}

void cel_mai_lung()
{
    lp[1]=1;
    if(lg==0)
        return;
    for(int i=2; i<lg; i++)
    {
        og=2*centru-i;
        dif=dr-i;
        if(dif>0)
            lp[i]=min(lp[og],dif);
        while ( ((i + lp[i]) < lg && (i - lp[i]) > 0) && ( ((i + lp[i] + 1) % 2 == 0) || (cuv[(i + lp[i] + 1)/2] == cuv[(i - lp[i] - 1)/2] )))
                lp[i]++;
        if (i+lp[i]>dr)
        {
            centru=i;
            dr=i+lp[i];
        }
        if(i%2==0)
            suma+=(lp[i])/2;
        else
            suma+=(lp[i]+1)/2;
    }
}

int main()
{
    freopen("pscpld.in","r",stdin);
    freopen("pscpld.out","w",stdout);
    citire();
    cel_mai_lung();
    cout<<suma;
    return 0;
}