#include<cstdio>
#include<fstream>
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<vector>
#include<bitset>
#include<deque>
#include<queue>
#include<set>
#include<map>
#include<cmath>
#include<cstring>
#include<ctime>
#include<cstdlib>
#include<unordered_map>

#define ll long long
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
#define pll pair<ll,ll>

using namespace std;

const int nmax = 1000005;

int i, n, C, R, mirror, l, r, p[2 * nmax];
ll sol;
string s, t;

int main()
{
    cin.sync_with_stdio(false);
    freopen("pscpld.in", "r", stdin);
    freopen("pscpld.out", "w", stdout);

    cin >> s;

    t += '#';
    for(i = 0; i < s.size(); i++)
    {
        n++;
        t += s[i];
        p[n] = 1;
        t += '$';
        n++;
    }

    for(i = 1; i < n; i++)
    {
        mirror = 2 * C - i;

        if(i <= R)
            p[i] = min(p[mirror], R - i + 1);

        l = i - p[i] + 1;
        r = i + p[i] - 1;

        while(l - 2 >= 1 && r + 2 <= n && t[l - 2] == t[r + 2])
        {
            l -= 2;
            r += 2;
            p[i] += 2;
        }

        if(r > R)
        {
            R = r;
            C = i;
        }

        sol += (p[i] + 1) / 2;
    }

    cout << sol << '\n';

    return 0;
}