Elevation Difference Estimation

Given two temperature measurements, T₁ and T₂, where T₁ is the temperature measured at the lower point (in °C) and T₂ is the temperature measured at the higher point (in °C), you are to calculate the estimated elevation difference between these two points. The relation between the temperature difference and elevation difference is given by the formula:

\(E = \frac{T_1 - T_2}{0.006}\)

where \(E\) is the elevation difference in meters. The final result must be rounded to the nearest integer.

Note: When T₁ is less than T₂, the elevation difference will be negative.

inputFormat

The input consists of a single line containing two space-separated integers: T₁ (temperature at the lower point) and T₂ (temperature at the higher point), both in degrees Celsius.

outputFormat

The output is a single integer representing the estimated elevation difference in meters, computed using the formula \(E = \frac{T_1 - T_2}{0.006}\) and rounded to the nearest integer. This integer should be printed on standard output.

## sample

20 15

833

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