#include <bits/stdc++.h>

using namespace std;

ifstream f("pscpld.in");
ofstream g("pscpld.out");

const int nmax = 1e6;
int manacher[2*nmax+3];
int st,dr,n,r;
long long sol=1;
string cuv;
char s[2*nmax+3];

int main()
{
    f>>cuv;
    n=cuv.length();
    for(int i=0; i<2*n; i++)
    {
        if(i%2==0) s[i]='#';
        else s[i]=cuv[i/2];
    }
    manacher[1]=1;
    st=1; 
    dr=2;
    for(int i=2; i<2*n; i++)  
    {
        r = min( manacher[st-(i-st)], max(dr-i,0)) ;
        while(i+r<2*n && i>r && s[i+r+1] == s[i-r-1])
        {
            r++;
        }
        if(i+r>dr) st=i, dr=i+r;
        manacher[i]=r;
        sol+=r/2+i%2;
    }
    g<<sol;
}