#include <bits/stdc++.h>
using namespace std;
int dist[7][7] = {{0, 0, 0, 0, 0, 0, 0},      {6, 0, 0, 0, 0, 0, 0},
                  {13, 7, 0, 0, 0, 0, 0},     {18, 12, 5, 0, 0, 0, 0},
                  {23, 17, 10, 5, 0, 0, 0},   {43, 37, 30, 25, 20, 0, 0},
                  {58, 52, 45, 40, 35, 15, 0}};
int money[7][7] = {
    {0, 300, 500, 600, 700, 1350, 1650}, {0, 0, 300, 450, 600, 1150, 1500},
    {0, 0, 0, 250, 400, 1000, 1350},     {0, 0, 0, 0, 250, 850, 1300},
    {0, 0, 0, 0, 0, 600, 1150},          {0, 0, 0, 0, 0, 0, 500}};
int a, b, c, d, e, f;
int main() {
  while (true) {
    cin >> a;
    if (a == 0) {
      break;
    }
    cin >> b >> c >> d >> e >> f;
    b = b * 60 + c;
    e = e * 60 + f;
    a--;
    d--;
    for (int i = 0; i < 7; i++) {
      for (int j = 0; j < 7; j++) {
        if (dist[i][j] == 0) {
          dist[i][j] = dist[j][i];
        }
        if (money[i][j] == 0) {
          money[i][j] = money[j][i];
        }
      }
    }
    if (((b >= 1050 && b <= 1170) || (e >= 1050 && e <= 1170)) &&
        dist[a][d] <= 40) {
      if (money[a][d] % 100 == 0) {
        cout << money[a][d] / 2 << endl;
      } else {
        cout << money[a][d] / 2 + 25 << endl;
      }
    } else {
      cout << money[a][d] << endl;
    }
  }
}
