#include <bits/stdc++.h>
using namespace std;
#define int long long
typedef pair<int,int> P;
int INF = 5e18+7;
int mod = 1e9+7;
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
long double pi = 3.141592653589793238;
signed main() {
    int A,B;
    cin >> A >> B;
    int a = (A*30+B/2)%360;
    int b = (6*B)%360;
    if(a == b) {
        cout << 0 << endl;
    }
    else {
        cout << ((a+360-b)%360*120+B%2*60)/11 << endl;
    }
}