시간 제한메모리 제한제출정답맞힌 사람정답 비율
2 초 512 MB135836420132.109%

문제

양의 정수 n이 주어졌을 때 n의 팩토리얼인 n!을 구하는 것은 쉽다. 이번에는 n!이 주어졌을 때 n을 구해 보자.

입력

어떤 자연수 n에 대해 n!이 입력으로 주어진다. n!의 자리수는 106 이하이다.

출력

n을 출력한다.

예제 입력 1

120

예제 출력 1

5

예제 입력 2

51090942171709440000

예제 출력 2

21

예제 입력 3

10888869450418352160768000000

예제 출력 3

27
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출처

ICPC > Regionals > North America > North America Qualification Contest > ACM-ICPC North America Qualifier 2016 G번

  • 문제를 번역한 사람: jh05013
  • 빠진 조건을 찾은 사람: sait2000
  • 문제를 만든 사람: Marko Berezovsky