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Problems

Clocks

Clocks

Time limit 1 second
Memory limit 64 MiB

The driking-clock strikes so many beats every hour as face has them from 1 to 12, and one time when the minute hand indicates 6 o’clock. Knowing the start and final period of 24-hours period( which exposes in hours and minutes), count the general number of strikes for this term.

Input data

Start and end time of one calendar day in hours (H) and minutes (M) by a space (0H23, 0M59).

Output data

The answer to the problem.

Examples

Input example #1
13 30 15 10
Output example #1
7