#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

map<ll, ll> prime_factor(ll n) {
    ll m = n;
    map<ll, ll> ret;
    for (ll i = 2; i * i <= n; i++) {
        while (n % i == 0) {
            ret[i] += m;
            n /= i;
        }
    }
    if (n != 1)
        ret[n] = m;
    return ret;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int L, R;
    cin >> L >> R;

    map<ll, ll> pf = prime_factor(L);
    for (int i = L + 1; i <= R; ++i) {
        map<ll, ll> cur = prime_factor(i);
        for (auto &[k, v] : pf) {
            pf[k] = min(v, cur[k]);
        }
    }

    ll ans = 1;
    for (auto &[k, v] : pf) {
        while (v--)
            ans *= k;
    }
    cout << ans << "\n";

    return 0;
}