e-olymp
Problems

Clocks

Clocks

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

Start and end timeof onecalendar dayin hours(H)and minutes(M)by a space (0H23, 0M59).

Output

The answerto the problem.

Time limit 1 second
Memory limit 64 MiB
Input example
13 30 15 10
Output example
7