tab = [[0 for x in range(100)] for x in range(100)] 
tab[0][0] = 1;
for digits in range(9):
	for sum in range(90):
		for last in range(10):
			tab[digits + 1][sum + last] += tab[digits][sum];

def count(n, sum, digits):
	if (n == 0):
		return (sum == 0) and 1 or 0;
	first = n/10**digits;
	if (sum < first):
		return 0;
	ret = count(n % 10**digits, sum-first, digits-1);
	for d in range(first):
		ret += tab[digits][sum-d];
	return ret;