CF220D Little Elephant and Triangle

The Little Elephant is playing with the Cartesian coordinates' system. Most of all he likes playing with integer points. The Little Elephant defines an integer point as a pair of integers $ (x; y) $ , such that $ 0

A single line contains two integers $ w $ and $ h $ $ (1

In a single output line print an integer — the remainder of dividing the answer to the problem by $ 1000000007 $ $ (10^{9}+7) $ .