#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int a, b;
    cin >> a >> b;

    ++b;
    int imos[32] = {0};
    ++imos[a];
    --imos[b];

    rep(i, 31)
        imos[i + 1] += imos[i];

    cout << 3 - (imos[23] + imos[24] + imos[25]) << endl;

    return 0;
}