#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
FILE *f=fopen("pscpld.in","r");
FILE *g=fopen("pscpld.out","w");
char A[1000005];
char B[2000005];
int L[2000005];
int id,N;
long long rez;
int main()
{
    fgets(A+1,1000005,f);N=strlen(A+1);N=N-(A[N]=='\n');
    for(int i=1;i<=N;i++)
        B[2*i]=A[i],B[2*i-1]='#';
    B[N=2*N+1]='#';
    for(int i=1;i<=N;i++)
    {
        if(id+L[id]>=i)
            L[i]=min(L[2*id-i],id+L[id]-i);
        while(i-L[i]>1&&B[i-L[i]-1]==B[i+L[i]+1])L[i]++;
        rez+=(L[i]+1)/2;
        if(i+L[i]>id+L[id])id=i;
    }
    fprintf(g,"%lld",rez);
    fclose(f);
    fclose(g);
    return 0;
}