#include<iostream>

#include<cstdio>

#include<cstring>

using namespace std;

char s[];

int nex[],len;

long long max_ans;

void getnext(){

    for(int i=,j=;i<=len;i++){//从2开始啊，扎心了老铁

        while(s[i]!=s[j+]&&j)j=nex[j];

        if(s[i]==s[j+])nex[i]=++j;

    }

}

void slove(int k){

    int js=;

    for(int i=,j=;i<=len;i++){

        while(s[i]!=s[j+]&&j)j=nex[j];

        if(s[i]==s[j+])++j;

        if(j==k){

            js++;j=nex[j];

        }

    }

//    cout<<k<<" "<<js<<" "<<js*k<<endl;

    max_ans=max(max_ans,(long long)js*k);

}

int main(){

    ios::sync_with_stdio();

    freopen("string_maxval.in","r",stdin);

    freopen("string_maxval.out","w",stdout);

    scanf("%s",s+);

    len=strlen(s+);

    getnext();

    for(int i=;i<=len;i++)slove(i);

    printf("%lld\n",max_ans);

    return ;

}

#include<cstdio>

#include<iostream>

#include<cstring>

using namespace std;

const int maxl=;

char s[maxl],su[maxl];

int next[maxl],l,ans=,cs[maxl];

void getnext()

{

    next[]=-;

    l=strlen(s);

    for(int j,i=;i<l;i++)

    {

        j=next[i-];

        while(s[i]!=s[j+]&&j>=)j=next[j];

        next[i]=s[i]==s[j+]?j+:-;

    }

}

int main()

{

    freopen("string_maxval.in","r",stdin);

    freopen("string_maxval.out","w",stdout);

    scanf("%s",s);

    getnext();

    for(int i=l-;i>=;--i)

    {

        cs[i]++;

        cs[next[i]]+=cs[i];

        if(cs[i]*(i+)>ans)ans=cs[i]*(i+);

    }

    cout<<ans;

    fclose(stdin);fclose(stdout);

    return ;

}