#include <iostream>
#include <string>
#include <vector>
#include <set>
#include <cmath>
#include <stack>
#include <algorithm>
#include <iomanip>
#include <map>
#include <queue>
#include <functional>
#include <numeric>
using ll = long long;
using namespace std;

const ll MOD = 1e9 + 7;

int arr[32];
int main(void)
{
    int A, B;
    cin >> A >> B;
    for (int i = 0; i < 32; ++i)
        arr[i] = 1;
    for (int i = A; i <= B; ++i)
        arr[i]--;

    cout << arr[23] + arr[24] + arr[25] << endl;
    return 0;
}