http://www.reddit.com/r/Python/comments/kxfjn/

HS11DIVS.py

#!/usr/bin/env python

def HS11DIVS(a, b, x, l, r):
    if a % x:
        a += x - a % x

    current, matches = a, 0
    while current <= b:
        current_sum = sum(int(str_digit) for str_digit in str(current))
        if l <= current_sum <= r:
            matches += 1
        current += x

    return matches % 1000000007


if __name__ == '__main__':
    a, b = (int(i) for i in raw_input().split())
    x, l, r = (int(i) for i in raw_input().split())

    print HS11DIVS(a, b, x, l, r)