#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using namespace std;

int main()
{
    int a, b, ds;
    cin >> a >> b;
    double l, s;
    a = a*300 + b*5;
    b = b*60;
    ds = ((a+3600 - b)%3600)*60/55;
    cout << ds << endl;
}