

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {


		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long count = 0;
		long h = 100L;

		while(h < x) {
			h = (long)Math.floor(h * 1.01);
			count++;
		}

		System.out.println(count);

		sc.close();




	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz