Sum of Odd Numbers in Range

Given two non-negative integers \(m\) and \(n\) (with \(m \le n\) and \(n \le 300\)), compute the sum of all odd numbers in the interval \([m, n]\). For example, if \(m = 3\) and \(n = 12\), the sum is \(3 + 5 + 7 + 9 + 11 = 35\).

inputFormat

The input consists of two space-separated non-negative integers \(m\) and \(n\).

outputFormat

Output a single integer which is the sum of all odd numbers between \(m\) and \(n\) (inclusive).

sample

3 12

35