
import java.util.Scanner;

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

		Scanner sc=new Scanner(System.in);
		long X=sc.nextLong();

		long h =100L;
		int count = 0;
		sc.close();

		while(h < X) {
			h *= 1.01;
			count++;
		}

		System.out.println(count);




	}
}

/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