How many times do the digital X (0 < x < 9) appear in all integers in interval 1 to n? For example, in 1 to 11, that is, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,the digital 1 appear 4 times.

Enter a total of 1 rows, including 2 integers n, x, separated by a space.

The output consists of 1 lines, which contain an integer representing the number of X appearing.

对于 100%的数据,1≤ n ≤ 1,000,000,0 ≤ x ≤ 9。