#include <bits/stdc++.h>
using namespace std;
int main() {
  int i, j, k;
  vector<vector<int> > distance(8, vector<int>(8));
  vector<vector<int> > fee(8, vector<int>(8));
  fee[1][2] = 200;
  fee[1][3] = 500;
  fee[1][4] = 600;
  fee[1][5] = 700;
  fee[1][6] = 1350;
  fee[1][7] = 1650;
  fee[2][3] = 350;
  fee[2][4] = 450;
  fee[2][5] = 600;
  fee[2][6] = 1150;
  fee[2][7] = 1500;
  fee[3][4] = 250;
  fee[3][5] = 400;
  fee[3][6] = 1000;
  fee[3][7] = 1350;
  fee[4][5] = 250;
  fee[4][6] = 850;
  fee[4][7] = 1300;
  fee[5][6] = 600;
  fee[5][7] = 1150;
  fee[6][7] = 500;
  distance[1][2] = 6;
  distance[1][3] = 13;
  distance[1][4] = 18;
  distance[1][5] = 23;
  distance[1][6] = 42;
  distance[1][7] = 58;
  distance[2][3] = 7;
  distance[2][4] = 12;
  distance[2][5] = 17;
  distance[2][6] = 37;
  distance[2][7] = 52;
  distance[3][4] = 5;
  distance[3][5] = 10;
  distance[3][6] = 30;
  distance[3][7] = 40;
  distance[4][5] = 5;
  distance[4][6] = 25;
  distance[4][7] = 40;
  distance[5][6] = 20;
  distance[5][7] = 35;
  distance[6][7] = 15;
  int s, e, h, m;
  int timeStart = 17 * 60 + 30;
  int timeEnd = 19 * 60 + 30;
  int r;
  bool f;
  while (cin >> s, s) {
    f = false;
    cin >> h >> m;
    if (timeStart <= h * 60 + m && h * 60 + m <= timeEnd) f = true;
    cin >> e >> h >> m;
    if (timeStart <= h * 60 + m && h * 60 + m <= timeEnd) f = true;
    r = fee[s][e];
    if (f && distance[s][e] <= 40) {
      r /= 2;
      if (r % 50) {
        r += 25;
        r /= 50;
        r *= 50;
      }
    }
    cout << r << endl;
  }
  return 0;
}
