Problems
Isosceles triangle
Isosceles triangle
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