import java.util.Scanner;

class Main {
    public static void main(final String[] args) {
        Scanner sc = new Scanner(System.in);
        String x = sc.next();
        double xDouble = Double.valueOf(x);

        int ans = 0;
        double tot = 100;
        while (tot < xDouble) {
            tot = Math.floor(tot * 1.01);
            ans ++;
        }

        System.out.println(ans);    

    }
}

/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