import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	} main {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long x = sc.nextLong(); x sc.nextLong() sc.nextLong sc long deposit = 100; deposit 100 long result = 0; result 0 while(x > deposit) {
			deposit*=1.01;
			result++;
		} x > deposit x deposit {
			deposit*=1.01;
			result++;
		} deposit*=1.01 deposit 1.01 result++ result System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	}

} Main
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x = sc.nextLong();
		long deposit = 100;
		long result = 0;
		while(x > deposit) {
			deposit*=1.01;
			result++;
		}
		System.out.println(result);

	}

}
