Find the number
Execution time limit is 1 second
Runtime memory usage limit is 128 megabytes
Find the integer value of n, if its previous and next numbers are known.
Input
Two integers - the previous and the next number for n, given in any order in one line, space separated. The numbers do not exceed 10^9 by absolute value.
Output
Print the value of n.
Examples
Input #1
Answer #1
Input #2
Answer #2
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