Longest Consecutive Normal Blood Pressure Hours

In the intensive care unit, the patient’s blood pressure is measured every hour. A measurement is considered normal if the systolic pressure is between $90$ and $140$ (inclusive) and the diastolic pressure is between $60$ and $90$ (inclusive). Given a series of blood pressure measurements, compute the longest consecutive period (in hours) during which the blood pressure was normal.

inputFormat

The first line contains an integer $n$ representing the number of measurements. Each of the following $n$ lines contains two integers denoting the systolic and diastolic pressures respectively.

outputFormat

Output a single integer representing the longest consecutive number of hours during which the blood pressure measurements were normal.

sample

5
120 80
100 70
110 80
130 85
140 90

5