#include <bits/stdc++.h>

#define fio ios_base::sync_with_stdio(0); cin.tie(0)
#define finput freopen("input.txt", "r", stdin)
#define foutput freopen("output.txt", "w", stdout)

using namespace std;
typedef long long ll;
typedef long double ld;

ll l, r;

bool check(ll y, ll n)
{

    if (n > (ld(18) / log10(y))) return false;
    ll y_n, y_plus_n;
    y_n = pow(y, n - 1);
    y_plus_n = pow(y + 1, n - 1);

    ll mult = (l - 1) / y_n + 1;
    ll sravn = mult * y_plus_n;
    if (sravn > r || sravn < l) return false;
    return true;
}

ll best_n(ll y)
{
    for (ll n = 1; n <= 45; ++ n)
    {
        if (!check(y, n)) return n - 1;
    }
}
const int C = 1e7;
int main()
{

    cin >> l >> r;
    ll ans = 0;
    for (ll y = 1; y <= C; ++ y)
    {
        ans = max(ans, best_n(y));
    }
    cout << ans;

}