Background

Description

Return the sum of the numbers in the array, except ignore sections of numbers starting with a 6 and extending to the next 7 (every 6 will be followed by at least one 7). Return 0 for no numbers.

Format

Input

Output

Samples

[1 2 2]

5

[1 2 2 6 99 99 7]

5

[1 1 6 7 2]

4

Limitation

1s, 1024KiB for each test case.