#include <iostream>

int main() {
    int n = 0;
    int a, b;
    std::cin >> a >> b;
    for (int i = a; i <= b; i++) {
        if (i==23 || i == 24 || i ==25)
            n++;
    }
    
    std::cout << 3 - n << std::endl;
   
}