Sum Of Four :
Difficulty Level : Easy
Submissions : 75
Asked In :
Marks :100
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You are given four integers a,b,c and d. Find the sum of the negative number out of these four numbers and print the same.
Input
the first line of the test case contains 4 integers separated by spaces a,b,c and d. ($$$-10^3 \le a,b,c,d \le 10^3$$$)
Output
Print the sum of negative number out of these four numbers
Examples
Input
2 -3 -14 7
Output
-17
Input
12 43 1 0
Output
0
Note
Print 0 if no negative number is present
