#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef long long ll;

const double eps = 1e-5;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int a, b; cin >> a >> b;
    a %= 12;
    double da = 1.0/(3600.0*12.0);
    double db = 1.0/(3600.0);
    double dif = (double)a/12.0+(double)b/720.0-(double)b/60.0;
    if(dif+eps < 0) dif += 1.0;
    cout << (int)(dif/(db-da)) << endl; 
}