#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll l, r;
    cin >> l >> r;
    if ((l >= 1 && l <= 295 && r >= 1 && r <= 295) || (l >= 296 && l <= 416 && r >= 296 && r <= 416) || (l >= 417 && l <= 420 && r >= 417 && r <= 420)) cout << 1;
    else if ((l >= 1 && l <= 295 && r >= 296 && r <= 416) || (l >= 296 && l <= 416 && r >= 417 && r <= 420)) cout << 2;
    else if (l >= 1 && l <= 295 && r >= 417 && r <= 420) cout << 3;
    else cout << 0;
    return 0;
}