import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    } main {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long X = sc.nextLong(); X sc.nextLong() sc.nextLong sc long year = 0; year 0 long result = 100; result 100 for (int i = 1; result < X; year++) {
            result *= 1.01;
        } int i = 1; int i = 1; i 1 result < X result X year++ year++ year {
            result *= 1.01;
        } {
            result *= 1.01;
        } result *= 1.01 result 1.01 System.out.println(year) System.out.println System.out System System.out year String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        
        long year = 0;
        long result = 100;
        for (int i = 1; result < X; year++) {
            result *= 1.01;
        }
        System.out.println(year);
    }
}