Water Tracker

1 16
200000000 1700000000
300000000 1800000000
400000000 1900000000
500000000 2000000000
600000000 2100000000
700000000 2200000000
800000000 2300000000
900000000 2400000000
1000000000 2500000000
1100000000 2600000000
1200000000 2700000000
1300000000 2800000000
1400000000 2900000000
1500000000 3000000000
3100000000