#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr ll LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int a, b; cin >> a >> b;
  a %= 12;
  int t = a * 60 * 60 + b * 60;
  if (t == 0) {
    cout << 0 << '\n';
  } else if (t <= 1 * 60 * 60 + 5 * 60 + 27) {
    cout << 1 * 60 * 60 + 5 * 60 + 27 - t << '\n';
  } else if (t <= 3 * 60 * 60 + 16 * 60 + 21) {
    cout << 3 * 60 * 60 + 16 * 60 + 21 - t << '\n';
  } else if (t <= 4 * 60 * 60 + 21 * 60 + 49) {
    cout << 4 * 60 * 60 + 21 * 60 + 49 - t << '\n';
  } else if (t <= 5 * 60 * 60 + 27 * 60 + 16) {
    cout << 5 * 60 * 60 + 27 * 60 + 16 - t << '\n';
  } else if (t <= 6 * 60 * 60 + 32 * 60 + 43) {
    cout << 6 * 60 * 60 + 32 * 60 + 43 - t << '\n';
  } else if (t <= 7 * 60 * 60 + 38 * 60 + 10) {
    cout << 7 * 60 * 60 + 38 * 60 + 10 - t << '\n';
  } else if (t <= 8 * 60 * 60 + 43 * 60 + 38) {
    cout << 8 * 60 * 60 + 43 * 60 + 38 - t << '\n';
  } else if (t <= 9 * 60 * 60 + 49 * 60 + 5) {
    cout << 9 * 60 * 60 + 49 * 60 + 5 - t << '\n';
  } else if (t <= 10 * 60 * 60 + 54 * 60 + 32) {
    cout << 10 * 60 * 60 + 54 * 60 + 32 - t << '\n';
  } else {
    cout << 12 * 60 * 60 - t << '\n';
  }
  return 0;
}