#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>

int main()
{
    int a, b;
    std::cin >> a >> b;
    int c = 0;
    if(23 < a || b < 23) c++;
    if(24 < a || b < 24) c++;
    if(25 < a || b < 25) c++;
    std::cout << c << std::endl;
    return 0;
}