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Problems

Isosceles triangle

Isosceles triangle

Time limit 1 second
Memory limit 128 MiB

Three positive integers a, b and c are given. Determine if there exists an isosceles triangle with the lengths of these sides.

Input data

Three positive integers a, b and c.

Output data

Print the sum of the given numbers if there exists an isosceles triangle with side lengths a, b, c, and No otherwise.

Examples

Input example #1
7 7 3
Output example #1
17
Input example #2
4 6 9
Output example #2
No