// Template
#include "bits/stdc++.h"
#define rep_override(x, y, z, name, ...) name
#define rep2(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep3(i, l, r) for (int i = (int)(l); i < (int)(r); ++i)
#define rep(...) rep_override(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define per(i, n) for (ll i = (ll)(n) - 1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
using namespace std;
using ll = long long;
constexpr int inf = 1001001001;
constexpr ll INF = 3003003003003003003LL;
template <typename T>
inline bool chmin(T &x, const T &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T> 
inline bool chmax(T &x, const T &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
struct IOSET {
    IOSET() {
        cin.tie(0);
        ios::sync_with_stdio(0);
        cout << fixed << setprecision(10);
    }
} ioset;

// Main
int main() {
    int a, b;
    cin >> a >> b;
    if (a >= 12) a -= 12;
    int x = 60 * a + b, y = 12 * b;
    // cout << x << " " << y << "\n";
    if (x < y) {
        cout << (x - y + 720) * 60 / 11 << "\n";
    } else {
        cout << (x - y) * 60 / 11 << "\n";
    }
}