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#include <algorithm>
#include <iostream>
#include <array>
#include <vector>
#include <numeric>
#include <random>
#include <chrono>


using namespace std;

//#define int long long
#pragma comment(linker,"/STACK:1000000000,1000000000")

const long long INF = 1e9 + 7;
const int MAXN = 1e6 + 1000;
const int N = 1e5 + 10;

const int M1 = 1e9 + 123;
const int M2 = 1e9 + 321;
int P1 = 22811;
int P2 = 22699;

array<int, MAXN> power1, power2;

inline void init_pow() {
    power1[0] = 1;
    power2[0] = 1;
    for (int i = 1; i < MAXN; ++i) {
        power1[i] = (1ll * power1[i - 1] * P1) % M1;
        power2[i] = (1ll * power2[i - 1] * P2) % M2;
    }
}

inline void build_hash(string& s, vector<pair<int, int>>& h) {
    int n = s.size();
    h.resize(n + 1);
    h[0].first = 0;
    h[0].second = 0;

    for (int i = 0; i < n; ++i) {
        h[i + 1].first = (h[i].first + 1ll * s[i] * power1[i]) % M1;
        h[i + 1].second = (h[i].second + 1ll * s[i] * power2[i]) % M2;
    }
}

inline bool is_equal(vector<pair<int, int>>& h_l, vector<pair<int, int>>& h_r, int start1, int start2, int len) {
    pair<int, int> d_l, d_r;
    d_l.first = ((h_l[start1 + len].first - h_l[start1].first + M1) % M1 * 1ll * power1[start2]) % M1;
    d_l.second = ((h_l[start1 + len].second - h_l[start1].second + M2) % M2 * 1ll * power2[start2]) % M2;

    d_r.first = ((h_r[start2 + len].first - h_r[start2].first + M1) % M1 * 1ll * power1[start1]) % M1;
    d_r.second = ((h_r[start2 + len].second - h_r[start2].second + M2) % M2 * 1ll * power2[start1]) % M2;

    return d_l == d_r;
}

inline int random_key(const int before, const int after) {
    auto seed = std::chrono::high_resolution_clock::now().time_since_epoch().count();
    std::mt19937 mt_rand(seed);
    int base = std::uniform_int_distribution<int>(before + 1, after)(mt_rand);
    return base;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    P1 = random_key(256, M1);
    P2 = random_key(256, M2);

    string a, b;
    cin >> a;
    int n = a.size();
    b = a;
    reverse(b.begin(), b.end());

    vector<pair<int, int>> h_a, h_b;
    init_pow();
    build_hash(a, h_a);
    build_hash(b, h_b);

    long long ans = 0;

    for (int i = 0, j = n - 1; i < n; ++i, --j) {
        int l = 0, r = min(n - i, n - j) + 1;
        while (r - l > 1) {
            int mid = (r + l) / 2;
            if (is_equal(h_a, h_b, i, j, mid)) {
                l = mid;
            } else {
                r = mid;
            }
        }
        ans += l;

        l = 0, r = min(n - i - 1, n - j) + 1;
        while (r - l > 1) {
            int mid = (r + l) / 2;
            if (is_equal(h_a, h_b, i + 1, j, mid)) {
                l = mid;
            } else {
                r = mid;
            }
        }
        ans += l;
    }
    cout << ans << '\n';
}