import java.util.Scanner;
 
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double num1 = scan.nextDouble();
        double mny = 100;
        double risoku = 1.01;
            
        int cnt;    
        for(cnt=0;mny<num1;cnt++){
            long mny2 = (long)(mny*risoku);
            mny = mny2;
            }
        System.out.println(cnt);
        scan.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