8
0	50	9999	9999	9999	9999	9999	9999
50	0	30	9999	9999	9999	9999	9999
9999	30	0	10	9999	40	9999	9999
9999	9999	10	0	60	9999	40	9999
9999	9999	9999	60	0	9999	9999	9999
9999	9999	40	9999	9999	0	40	60
9999	9999	9999	40	9999	40	0	9999
9999	9999	9999	9999	9999	60	9999	0