#include <bits/stdc++.h>
using namespace std;
ifstream in("pscpld.in");
ofstream out("pscpld.out");
string s,a;
int main()
{
    ios_base::sync_with_stdio(false);
    in.tie(0),out.tie(0);
    in>>s; a="@#";
    for(char c:s)
        a+=c+string("#");
    a+='$';
    int l=0,r=-1;
    int n=a.size()-2;
    vector<int> p(n+2);
    long long ans=0;
    for(int i=1;i<=n;++i)
    {
        p[i]=max(0,min(r-i,p[l+r-i]));
        while(a[i-p[i]]==a[i+p[i]])
            ++p[i];
        if(i+p[i]>r)
            l=i-p[i],r=i+p[i];
        if(i>1 and i<n)
            ans+=p[i]/2;
    }
    out<<ans<<'\n';
    return 0;
}