import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        long money = 100;
        long X = s.nextLong() ;
        int count = 0;

        while(money<X){
            money = (long)Math.floor(money*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