#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

using VT = string;

struct RollingHash {
	static const ll mo0=1000000021,mo1=1000000009;
	static ll mul0,mul1;
	static const ll add0=1000010007, add1=1003333331;
	static vector<ll> pmo[2];
	VT s; int l; vector<ll> hash_[2];
	void init(VT s) {
		this->s=s; l=s.size(); int i,j;
		hash_[0]=hash_[1]=vector<ll>(1,0);
		if(!mul0) mul0=10009+(((ll)&mul0+time(NULL))>>5)%1259,mul1=10007+(time(NULL)+((ll)&mul1)>>5)%2257;
		if(pmo[0].empty()) pmo[0].push_back(1),pmo[1].push_back(1);
		FOR(i,l) hash_[0].push_back((hash_[0].back()*mul0+add0+s[i])%mo0);
		FOR(i,l) hash_[1].push_back((hash_[1].back()*mul1+add1+s[i])%mo1);
	}
	ll hash(int l,int r) { // s[l..r]
		if(l>r) return 0;
		while(pmo[0].size()<r+2)
			pmo[0].push_back(pmo[0].back()*mul0%mo0), pmo[1].push_back(pmo[1].back()*mul1%mo1);
		return (((hash_[0][r+1]+(mo0-hash_[0][l]*pmo[0][r+1-l]%mo0))%mo0)<<32) | 
			             ((hash_[1][r+1]+(mo1-hash_[1][l]*pmo[1][r+1-l]%mo1))%mo1);
	}
	ll hash(VT s) { init(s); return hash(0,s.size()-1); }
	static ll concat(ll L ,ll R,int RL) { // hash(L+R) RL=len-of-R
		while(pmo[0].size()<RL+2) pmo[0].push_back(pmo[0].back()*mul0%mo0), pmo[1].push_back(pmo[1].back()*mul1%mo1);
		ll La=L>>32,Lb=(L<<32)>>32,Ra=R>>32,Rb=(R<<32)>>32;
		return (((Ra + La*pmo[0][RL])%mo0)<<32)|((Rb + Lb*pmo[1][RL])%mo1);
	}
};
vector<ll> RollingHash::pmo[2]; ll RollingHash::mul0,RollingHash::mul1;

pair<vector<int>,pair<int,int> > manacher(string S) {
	int L=S.size(),i,j,k;
	vector<int> rad(2*L-1,0);
	for(i=j=0;i<2*L-1;i+=k,j=max(j-k,0)) {
		while(i-j>=0 && i+j+1<=2*L-1 && S[(i-j)/2]==S[(i+j+1)/2]) j++;
		rad[i]=j;
		for(k=1;i-k>=0 && rad[i]-k>=0 && rad[i-k]!=rad[i]-k&&i+k<rad.size(); k++) rad[i+k]=min(rad[i-k],rad[i]-k);
	}
	i=max_element(rad.begin(),rad.end())-rad.begin();
	return make_pair(rad,make_pair((i-(rad[i]-1))/2,(i+(rad[i]-1))/2));
}

int N;
string S;
unordered_map<ll,pair<int,int>> R[202020];
unordered_map<ll,ll> num[202020];
RollingHash rh;

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>S;
	N=S.size();
	rh.init(S);
	vector<int> V=manacher(S).first;
	FOR(i,V.size()) if(V[i]>0) {
		int l,r;
		l=(i-(V[i]-1))/2;
		r=(i+(V[i]-1))/2;
		auto h=rh.hash(l,r);
		R[V[i]][h]={l,r};
		num[V[i]][h]++;
	}
	for(i=N;i>=3;i--) {
		FORR2(a,b,R[i]) {
			auto h=rh.hash(b.first+1,b.second-1);
			num[i-2][h]+=num[i][a];
			R[i-2][h]={b.first+1,b.second-1};
		}
	}
	ll ma=0;
	FOR(i,N+1){
		FORR2(a,b,R[i]) {
			num[i][a]*=i;
			int l=b.first;
			int r=b.second-1;
			while(r>=l) {
				auto h=rh.hash(l,r);
				if(R[r-l+1].count(h)) {
					num[i][a]+=num[r-l+1][h];
					break;
				}
				r--;
			}
			ma=max(ma,num[i][a]);
		}
	}
	cout<<ma<<endl;
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}