#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << a << endl;}
template<class T> void writes(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
void write(double a){cout << fixed << setprecision(12) << a << endl;}
void write(long double a){cout << fixed << setprecision(12) << a << endl;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

int prime(veci& v, int n) {
    bool p[5000001] = {1, 1};
    for(int i = 2; i <= n; i++) {
        if(p[i]) continue;
        v.push_back(i);
        for(int j = i * 2; j <= n; j += i)
            p[j] = true;
    }
    return v.size();
}


int main(void)
{
    ll x1,x2;
    veci pv;
    cin>>x1>>x2;
    int pn=prime(pv,100010);
    ll res=0,rp=0;
    rep(i,pn){
        REP(j,i,pn){
            ll pp=(ll)pv[i]*pv[j];
            if(pp<x1)continue;
            if(pp>x2)break;
            if(pv[i]==rp&&pp>=res){
                res=pp;
            }
            else if(pv[i]>rp){
                res=pp;
                rp=pv[i];
            }
        }
    }
    if(res>0){
        write(res);
        return 0;
    }
    ll sx=sqrt(x2);
    REP(x,x1,x2+1){
        rep(i,pn){
            ll y=pv[i];
            if(y>sx)break;
            if(x%y!=0)continue;
            if(y==rp&&x>=res){
                res=x;
            }
            else if(y>rp){
                res=x;
                rp=y;
            }
            break;
        }
    }
    write(res);
    return 0;
}