#include<cstdio>
#include<cstring>
using namespace std;
const int NMAX=1000000;
char v[2*NMAX+10];
int p[2*NMAX+10];
int n;
void extend(int pos)
{
    while(pos-p[pos]>0 && pos+p[pos]<=n && v[pos-p[pos]]==v[pos+p[pos]])
        p[pos]++;
    p[pos]--;
}
int main()
{
    freopen("pscpld.in","r",stdin);
    freopen("pscpld.out","w",stdout);
    scanf("%s",v+1);
    n=strlen(v+1);
    for(int i=n;i>=0;i--)
        {
        v[2*i+1]='#';
        v[2*i]=v[i];
        }
    n=2*n+1;
    int c=1;
    for(int i=2;i<=n;i++)
        {
        int i2=2*c-i,st=c-p[c],dr=c+p[c];
        if (i>dr)
            {
            extend(i);
            c=i;
            }
        else
            {
            if (i2-p[i2]>st)
                p[i]=p[i2];
            else
                {
                p[i]=dr-i;
                extend(i);
                c=i;
                }
            }
        }
    long long ans=0;
    for(int i=1;i<=n;i++)
        ans+=(long long)p[i]/2;
    printf("%lld\n",ans+n/2);
return 0;
}