Integer user$\_$number is read from input. Write a while loop that reads values from input and casts the values into integers, until a negative integer is read. In each iteration:

Update total$\_$sum with the sum of total$\_$sum and user$\_$number.

Then, read the next integer from input into variable user$\_$number.

The negative integer should not be included in the sum.

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Ex: If the input is:

$5$

$3$

$15$

$29$

$-44$

then the output is:

$52$