Let's call a number constitutive if it can be expressed as a sum of three or more successive positive integers. For example, 14 is a constitutive number because 14 = 2+3+4+5, but 13 is not a constitutive number.
You will be given two ints A and B. Return the number of constitutive numbers between A and B, inclusive.
|-||A will be between 1 and 1,000,000,000, inclusive.|
|-||B will be between A and A + 1000, inclusive.|