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// Artur Kraska, II UWr

#include <algorithm>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <cmath>
#include <list>
#include <set>
#include <map>

#include "palindromy.h"
#include "message.h"

#define forr(i, n)                  for(int i=0; i<n; i++)
#define FOREACH(iter, coll)         for(auto iter = coll.begin(); iter != coll.end(); ++iter)
#define FOREACHR(iter, coll)        for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter)
#define lbound(P,R,PRED)            ({typeof(P) X=P,RRR=(R), PPP = P; while(PPP<RRR) {X = (PPP+(RRR-PPP)/2); if(PRED) RRR = X; else PPP = X+1;} PPP;})
#define testy()                     int _tests; scanf("%d", &_tests); FOR(_test, 1, _tests)
#define CLEAR(tab)                  memset(tab, 0, sizeof(tab))
#define CONTAIN(el, coll)           (coll.find(el) != coll.end())
#define FOR(i, a, b)                for(int i=a; i<=b; i++)
#define FORD(i, a, b)               for(int i=a; i>=b; i--)
#define MP                          make_pair
#define PB                          push_back
#define deb(X)                      X;

#define M 1000000007
#define INF 1000000007

using namespace std;



// kod napisany przez Kube Radoszewskiego (znalazlem go w internecie)

//Palindromy parzyste
vector<int> malyManacher1(string s)
{
  string x("$"); x += s; x += '#'; // '$' i '#' - specjalne znaki
  vector<int> R;
  R.push_back(0);
  int i = 1, j = 0;
  while (i <= x.size() - 1)
  {
    while (x[i - j] == x[i + j + 1])
      j++;
    R.push_back(j);
    int k = 1;
    while (R[i - k] != R[i] - k && k <= j)
    {
      R.push_back(min(R[i - k], R[i] - k));
      k++;
    }
    j=max(j - k, 0); i += k;
  }
  return R;
}

//Palindromy nieparzyste
vector<int> malyManacher2(string s)
{
  string x("$"); x += s; x += '#'; // '$' i '#' - specjalne znaki
  vector<int> R;
  R.push_back(0);
  int i = 1, j = 0;
  while (i <= x.size() - 1)
  {
    while (x[i - j - 1] == x[i + j + 1])
      j++;
    R.push_back(j);
    int k = 1;
    while (R[i - k] != R[i] - k && k <= j)
    {
      R.push_back(min(R[i - k], R[i] - k)); k++;
    }
    j=max(j - k, 0); i += k;
  }
  return R;
}
/*
//Palindromy parzyste
vector<int> Manacher1(int pocz, int kon)
{
  string x("$"); x += s; x += '#'; // '$' i '#' - specjalne znaki
  vector<int> R;
  R.push_back(0);
  int i = pocz, j = 0;
  while (i <= x.size() - 1)
  {
    while (x[i - j] == x[i + j + 1])
      j++;
    R.push_back(j);
    int k = 1;
    while (R[i - k] != R[i] - k && k <= j)
    {
      R.push_back(min(R[i - k], R[i] - k));
      k++;
    }
    j=max(j - k, 0); i += k;
  }
  return R;
}

//Palindromy nieparzyste
vector<int> Manacher2(string s)
{
  string x("$"); x += s; x += '#'; // '$' i '#' - specjalne znaki
  vector<int> R;
  R.push_back(0);
  int i = 1, j = 0;
  while (i <= x.size() - 1)
  {
    while (x[i - j - 1] == x[i + j + 1])
      j++;
    R.push_back(j);
    int k = 1;
    while (R[i - k] != R[i] - k && k <= j)
    {
      R.push_back(min(R[i - k], R[i] - k)); k++;
    }
    j=max(j - k, 0); i += k;
  }
  return R;
}
*/
// koniec

int n, NR, ILE;

int main()
{
    NR = MyNodeId();
    ILE = NumberOfNodes();

    n = GetLength();

    if(true || n <= 50000000)
    {
        if(NR == 0)
        {
            long long res = 0;
            string s = "";
            forr(i, n)
                s += GetLetter(i);

            vector <int> v = malyManacher1(s);
            FOREACH(it, v)
                res += *it;
            v = malyManacher2(s);
            FOREACH(it, v)
                res += *it;

            printf("%lld\n", res + n);
        }
        return 0; // DO POPRAWY !!!
    }

    long long res = 0;

    int pocz = n*NR/ILE;
    int kon = n*(NR+1)/ILE-1;

//    cout << "pocz: " << pocz << ", kon: " << kon << endl;

    int dl = 0;
    FOR(i, pocz, kon)
    {
        dl = 0;
        while(i-dl >= 0 && i+dl < n && GetLetter(i-dl) == GetLetter(i+dl))
            dl++;
        res += dl;

        dl = 0;
        while(i-dl >= 0 && i+dl+1 < n && GetLetter(i-dl) == GetLetter(i+dl+1))
            dl++;
        res += dl;
    }

    PutLL(0, res);
    Send(0);
//    cout << "pisze do 0" << endl;

    if (NR != 0)
        return 0;

    res = 0;

    forr(i, ILE)
    {
//        cout << "zero czyta od " << i << endl;
        Receive(i);
        res += GetLL(i);
    }

    cout << res << endl;

    return 0;
}