#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int a, b;
  cin >> a >> b;
  vector<int> ans;
  rep(i, 12) ans.push_back(i * 12 * 60 * 60 / 11);
  Debug(ans);
  int now = (a * 3600 + b * 60) % (12 * 60 * 60);
  for (auto x : ans) {
    if (x >= now) {
      cout << x - now << endl;
      break;
    }
  }
  return 0;
}