Introduction to Python

Sum of negative absolutes

Given 5 different floating point numbers, your task is to compute the sum of all negative absolute values of the elements.

Input

Output

4
-3.5
2
-4
1

-14.5

Explanation: −∣4∣−∣−3.5∣−∣2∣−∣−4∣−∣1∣=−4−3.5−2−4−1=−14.5-\mid 4 \mid -\mid -3.5 \mid -\mid 2 \mid -\mid -4 \mid -\mid 1 \mid = -4 -3.5 - 2 - 4 - 1 = -14.5.

Constraints

Time limit: 1.6 seconds

Memory limit: 512 MB

Output limit: 1 MB