문제
어떤 숫자가 줄어들지 않는다는 것은 그 숫자의 각 자리 수보다 그 왼쪽 자리 수가 작거나 같을 때 이다.
예를 들어, 1234는 줄어들지 않는다.
줄어들지 않는 4자리 수를 예를 들어 보면 0011, 1111, 1112, 1122, 2223이 있다. 줄어들지 않는 4자리수는 총 715개가 있다.
이 문제에서는 숫자의 앞에 0(leading zero)이 있어도 된다. 0000, 0001, 0002는 올바른 줄어들지 않는 4자리수이다.
n이 주어졌을 때, 줄어들지 않는 n자리 수의 개수를 구하는 프로그램을 작성하시오.
출력
각 테스트 케이스에 대해 한 줄에 하나씩 줄어들지 않는 n자리 수의 개수를 출력한다.
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