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 time of one calendar day in hours (H) and minutes (M) by a space (0 ≤ H ≤ 23, 0 ≤ M ≤ 59).

Output

The answer to the problem.

Examples