how many integers between 1 and 10 ^ 20 are such that the sum of their digits is 2 ?
"the integers with a sum of 2 are : 2 , 20 , 200 , . . . , 2 * 10 ^ 19 and there are 20 integers in this list . also , these integers have a sum of 2 : 11 101 , 110 1001 , 1010 , 1100 etc . . . the number of integers in this list is 1 + 2 + . . . + 19 thus , the total number of integers is 1 + 2 + . . . + 19 + 20 = 20 * 21 / 2 = 210 the answer is b ."
subtract(10, add(add(multiply(const_2, const_100), multiply(add(const_3, const_4), const_10)), const_2))