#include <bits/stdc++.h>
using namespace std;
int cost[7][7] = {
    {0, 300, 500, 600, 700, 1350, 1650},   {300, 0, 350, 450, 600, 1150, 1500},
    {500, 350, 0, 250, 400, 1000, 1350},   {600, 450, 250, 0, 250, 850, 1300},
    {700, 600, 400, 250, 0, 600, 1150},    {1350, 1150, 1000, 850, 600, 0, 500},
    {1650, 1500, 1350, 1300, 1150, 500, 0}};
int dist[7][7] = {{0, 6, 13, 18, 23, 43, 58}, {6, 0, 7, 12, 17, 37, 52},
                  {13, 7, 0, 5, 10, 30, 45},  {18, 12, 5, 0, 5, 25, 40},
                  {23, 17, 10, 5, 0, 20, 35}, {43, 37, 30, 25, 20, 0, 15},
                  {58, 52, 45, 40, 35, 15, 0}};
int ToMinute(int h, int m) { return h * 60 + m; }
bool IsInTime(int h, int m) {
  return ToMinute(17, 30) <= ToMinute(h, m) &&
         ToMinute(h, m) <= ToMinute(19, 30);
}
int ToHalf(int n) {
  n /= 2;
  if (n % 50) n += 50 - n % 50;
  return n;
}
int main() {
  int ic1, ic2, h1, h2, m1, m2;
  printf("%d\n", ToHalf(450));
  while (cin >> ic1, ic1) {
    cin >> h1 >> m1 >> ic2 >> h2 >> m2;
    ic1--;
    ic2--;
    bool is_half =
        (IsInTime(h1, m1) || IsInTime(h2, m2)) && dist[ic1][ic2] <= 40;
    if (is_half)
      printf("%d\n", ToHalf(cost[ic1][ic2]));
    else
      printf("%d\n", cost[ic1][ic2]);
  }
  return 0;
}
