import java.util.Scanner;


public class Main {


//	final int MOD = 1000000007;


	public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	}
} import java.util.Scanner; Scanner java.util public class Main {


//	final int MOD = 1000000007;


	public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	}
} Main public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	} main {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	} long ans = 0; ans 0 Scanner sc = new Scanner(System.in); sc new Scanner(System.in) boolean f = false; f false long n = sc.nextLong(); n sc.nextLong() sc.nextLong sc double k = 100; k 100 double r = 1.01; r 1.01 do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n); k < n k n {
			k = Math.floor(k * r);
			ans++;
		} k = Math.floor(k * r) k Math.floor(k * r) Math.floor Math k * r k r ans++ ans System.out.println(ans) System.out.println System.out System System.out ans sc.close() sc.close sc String[] args args public class Main {


//	final int MOD = 1000000007;


	public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	}
} public class Main {


//	final int MOD = 1000000007;


	public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	}
} Main
import java.util.Scanner;


public class Main {


//	final int MOD = 1000000007;


	public static void main(String[] args) {

		long ans = 0;
		Scanner sc = new Scanner(System.in);
		boolean f = false;

		long n = sc.nextLong();


		//-------------------------------------------------------------------------------------

		double k = 100;
		double r = 1.01;

		do {
			k = Math.floor(k * r);
			ans++;
		} while(k < n);

		//-------------------------------------------------------------------------------------

//		for(int i = 0; i < n; i++) {
//			System.out.println(ans[i]);
//		}

//		if(f) {
//			System.out.println("OK");
//		} else {
//			System.out.println("NG");
//		}

		System.out.println(ans);

		sc.close();
	}
}