#pragma GCC optimize("Ofast")
#include "bits/stdc++.h"

// Begin Header {{{
using namespace std;

#ifndef DEBUG
#define dump(...)
#endif

#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define rep(i, b, e) for (intmax_t i = (b), i##_limit = (e); i < i##_limit; ++i)
#define repc(i, b, e) for (intmax_t i = (b), i##_limit = (e); i <= i##_limit; ++i)
#define repr(i, b, e) for (intmax_t i = (b), i##_limit = (e); i >= i##_limit; --i)
#define var(Type, ...) Type __VA_ARGS__; input(__VA_ARGS__)

constexpr size_t    operator""_zu(unsigned long long value) { return value; };
constexpr intmax_t  operator""_jd(unsigned long long value) { return value; };
constexpr uintmax_t operator""_ju(unsigned long long value) { return value; };

constexpr int INF = 0x3f3f3f3f;
constexpr intmax_t LINF = 0x3f3f3f3f3f3f3f3f_jd;

template <class T, class Compare = less<>>
using MaxHeap = priority_queue<T, vector<T>, Compare>;
template <class T, class Compare = greater<>>
using MinHeap = priority_queue<T, vector<T>, Compare>;

inline void input() {}
template <class Head, class... Tail>
inline void input(Head&& head, Tail&&... tail) {
    cin >> head;
    input(forward<Tail>(tail)...);
}

template <class Container, class Value = typename Container::value_type,
         enable_if_t<!is_same<Container, string>::value, nullptr_t> = nullptr>
         inline istream& operator>>(istream &is, Container &vs) {
             for (auto &v: vs) is >> v;
             return is;
         }

inline void output() { cout << "\n"; }
template <class Head, class... Tail>
inline void output(Head&& head, Tail&&... tail) {
    cout << head;
    if (sizeof...(tail)) cout << " ";
    output(forward<Tail>(tail)...);
}

template <class Container, class Value = typename Container::value_type,
         enable_if_t<!is_same<Container, string>::value, nullptr_t> = nullptr>
         inline ostream& operator<<(ostream &os, const Container &vs) {
             static constexpr const char *delim[] = {" ", ""};
             for (auto it = begin(vs); it != end(vs); ++it) {
                 os << delim[it == begin(vs)] << *it;
             }
             return os;
         }

template <class Iterator>
inline void join(const Iterator &Begin, const Iterator &End, const string &delim = "\n", const string &last = "\n") {
    for (auto it = Begin; it != End; ++it) {
        cout << ((it == Begin) ? "" : delim) << *it;
    }
    cout << last;
}

template <class T>
inline vector<T> makeVector(const T &initValue, size_t sz) {
    return vector<T>(sz, initValue);
}

template <class T, class... Args>
inline auto makeVector(const T &initValue, size_t sz, Args... args) {
    return vector<decltype(makeVector<T>(initValue, args...))>(sz, makeVector<T>(initValue, args...));
}

template <class Func>
class FixPoint : Func {
public:
    explicit constexpr FixPoint(Func&& f) noexcept : Func(forward<Func>(f)) {}

    template <class... Args>
        constexpr decltype(auto) operator()(Args&&... args) const {
            return Func::operator()(*this, std::forward<Args>(args)...);
        }
};

template <class Func>
static inline constexpr decltype(auto) makeFixPoint(Func&& f) noexcept {
    return FixPoint<Func>{forward<Func>(f)};
}

template <class Container>
struct reverse_t {
    Container &c;
    reverse_t(Container &c) : c(c) {}
    auto begin() { return c.rbegin(); }
    auto end() { return c.rend(); }
};

template <class Container>
auto reversed(Container &c) {
    return reverse_t<Container>(c);
}

template <class T>
inline bool chmax(T &a, const T &b) noexcept {
    return b > a && (a = b, true);
}

template <class T>
inline bool chmin(T &a, const T &b) noexcept {
    return b < a && (a = b, true);
}

template <class T>
inline T diff(const T &a, const T &b) noexcept {
    return a < b ? b - a : a - b;
}

void ioinit() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
    clog << fixed << setprecision(10);
}
// }}} End Header

// Real {{{
const long double EPS = 1e-10;
const long double PI = acos(-1);

struct Real {
    long double x;

    Real(long double x = 0) : x(x) {}
    Real(const Real& rhs) { x = rhs.x; }

    Real operator+(const Real& rhs) const { return Real(x + rhs.x); }
    Real& operator+=(const Real& rhs) { return x += rhs.x, *this; }
    Real operator-(const Real& rhs) const { return Real(x - rhs.x); }
    Real& operator-=(const Real& rhs) { return x -= rhs.x, *this; }
    Real operator*(const Real& rhs) const { return Real(x * rhs.x); }
    Real& operator*=(const Real& rhs) { return x *= rhs.x, *this; }
    Real operator/(const Real& rhs) const { return Real(x / rhs.x); }
    Real& operator/=(const Real& rhs) { return x /= rhs.x, *this; }
    Real operator-() const { return Real(-x); }
    Real& operator++() { return ++x, *this; }
    Real& operator--() { return --x, *this; }
    Real operator++(int) { Real tmp(x); return ++x, tmp; }
    Real operator--(int) { Real tmp(x); return --x, tmp; }
    bool operator==(const Real& rhs) const { return fabs(x - rhs.x) < EPS; }
    bool operator!=(const Real& rhs) const { return !(*this == rhs); }
    bool operator<(const Real& rhs) const { return (*this == rhs) ? false : x < rhs.x; }
    bool operator>(const Real& rhs) const { return (*this == rhs) ? false : x > rhs.x; }
    bool operator<=(const Real& rhs) const { return (*this == rhs) ? true : x < rhs.x; }
    bool operator>=(const Real& rhs) const { return (*this == rhs) ? true : x > rhs.x; }
    template <class T> explicit operator T() const { return static_cast<T>(x); }

    friend istream& operator>>(istream& is, Real& rhs) {
        is >> rhs.x;
        return is;
    }
    friend ostream& operator<<(ostream& os, const Real& rhs) {
        os << rhs.x;
        return os;
    }

    friend Real pow(const Real& n, const Real& p) { return pow(n.x, p.x); }
    friend Real pow(Real n, intmax_t p) {
        Real ret = 1;
        for (; p > 0; p >>= 1) {
            if (p & 1) ret *= n;
            n *= n;
        }
        return ret;
    }
    friend Real abs(const Real& rhs) { return abs(rhs.x); }
    friend Real sin(const Real& rhs) { return sin(rhs.x); }
    friend Real cos(const Real& rhs) { return cos(rhs.x); }
    friend Real tan(const Real& rhs) { return tan(rhs.x); }
    friend Real asin(const Real& rhs) { return asin(rhs.x); }
    friend Real acos(const Real& rhs) { return acos(rhs.x); }
    friend Real atan(const Real& rhs) { return atan(rhs.x); }
    friend Real atan2(const Real& lhs, const Real& rhs) { return atan2(lhs.x, rhs.x); }
    friend Real sqrt(const Real& rhs) { return sqrt(rhs.x); }
    friend Real ceil(const Real& rhs) { return ceil(rhs.x); }
    friend Real floor(const Real& rhs) { return floor(rhs.x); }
    friend Real round(const Real& rhs) { return round(rhs.x); }
};

using real_t = Real;
real_t operator""_r(long double value) { return value; };
// }}}

signed main() {
    ioinit();

    var(real_t, A, B);
    A = (intmax_t) A % 12;
    dump(A, B);

    const real_t ang_A = 30.0_r * A + 0.5_r * B;
    const real_t ang_B = 6.0_r * B;

    intmax_t res;
    if (ang_A >= ang_B) {
        res = intmax_t((ang_A - ang_B) * 60 / 5.5);
    } else {
        res = intmax_t((360.0_r - ang_B + ang_A) * 60 / 5.5);
    }

    output(res);
    return 0;
}