import java.util.*;
import java.lang.*;

public class Main {
    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        //金額X
        final long X ;
        //　入れる値
        long tempX=100;

        X = sc.nextLong();

        int i = 0;
        int flag = 0;
        for (; flag == 0; i++) {
            tempX = (long) ( tempX* 1.01);	
            if(tempX>=X){
                flag=1;
            }
        }
		System.out.println(i);
}
}
/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