#include <bits/stdc++.h>
int main(void) {
  int x[8][8];
  x[1][2] = 300;
  x[1][3] = 500;
  x[1][4] = 600;
  x[1][5] = 700;
  x[1][6] = 1350;
  x[1][7] = 1650;
  x[2][1] = 6;
  x[2][3] = 350;
  x[2][4] = 450;
  x[2][5] = 600;
  x[2][6] = 1150;
  x[2][7] = 1500;
  x[3][1] = 13;
  x[3][2] = 7;
  x[3][4] = 250;
  x[3][5] = 400;
  x[3][6] = 1000;
  x[3][7] = 1350;
  x[4][1] = 18;
  x[4][2] = 12;
  x[4][3] = 5;
  x[4][5] = 250;
  x[4][6] = 850;
  x[4][7] = 1300;
  x[5][1] = 23;
  x[5][2] = 17;
  x[5][3] = 10;
  x[5][4] = 5;
  x[5][6] = 600;
  x[5][7] = 1150;
  x[6][1] = 43;
  x[6][2] = 37;
  x[6][3] = 30;
  x[6][4] = 25;
  x[6][5] = 20;
  x[6][7] = 500;
  x[7][1] = 58;
  x[7][2] = 52;
  x[7][3] = 45;
  x[7][4] = 40;
  x[7][5] = 35;
  x[7][6] = 15;
  int v, y, a, b, h, m, val;
  while (1) {
    scanf("%d", &v);
    if (v == 0) break;
    scanf("%d %d %d %d %d", &a, &b, &y, &h, &m);
    if ((17 * 60 + 30 <= a * 60 + b && a * 60 + b <= 19 * 60 + 30) ||
        (17 * 60 + 30 <= h * 60 + m && h * 60 + m <= 19 * 60 + 30) ||
        (17 * 60 + 30 <= a * 60 + b && h * 60 + m <= 19 * 60 + 30)) {
      val = x[v][y] / 2;
      if (val % 100 != 0) {
        val = val / 100;
        val = val * 100 + 50;
      }
      printf("%d\n", val);
    } else
      printf("%d\n", x[v][y]);
  }
  return 0;
}
