#include <fstream>

using namespace std;
ifstream f("pscpld.in");
ofstream g("pscpld.out");
int n,m;
const int N=1000005;
string s;
int a[2*N];
string r;
int len,k;
char c;
int main()
{
    f>>r;
    s.push_back('*');
    for(auto x: r)
    {
        s.push_back(x);
        s.push_back('*');
    }

    int st=0,dr=0;
    int n=s.size();
    for(int i=0;i<n;i++)
    {
        if(i<=dr)
            len=min(dr-i+1,a[st+dr-i]);
        else
            len=1;
        while(s[i-len]==s[i+len]&&i-len>=0&&i+len<n)
            len++;
        a[i]=len;
        if(len+i-1>dr)
        {
            dr=i+len-1;
            st=i-len+1;
        }
    }
    long long s=0;
    for(int i=0;i<n;i++)
        s=s+a[i]/2;
    g<<s;
    return 0;
}