The sum of positive#8912

The sum of positive

1 second
64 megabytes
Very easy

The program processes a sequence of integers that concludes with the number . Your task is to calculate the sum of all positive numbers in this sequence, excluding the final zero.

Input

A sequence of integers, with each number provided on a separate line.

Output

A single integer representing the sum of the positive numbers in the sequence.

Examples

Example 1

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