Backup Size Report

Find the combined size of a directory tree's log files.

Input

$1 is the path to a directory, which may contain nested subdirectories to any depth.

Task

Find every file named *.log anywhere in the tree (recursively), and print the combined size of all of them, in bytes, as a single integer.

Output

A single integer: the total size in bytes. If there are no .log files anywhere in the tree, print 0.

Constraints

• At most 10,000 files in the directory.
• Non-.log files are never counted, regardless of size.
• An empty .log file (0 bytes) still counts as a match — it just contributes 0 to the total.

Example

Directory contents (name — size):

logs/app.log       — 120 bytes
logs/error.log     — 340 bytes
logs/readme.txt    — 50 bytes
archive/old.log    — 75 bytes

Output:

535