import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    }
} import java.math.BigInteger; BigInteger java.math import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    }
} Main public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    } main {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    } Long K; K Scanner sc = new Scanner(System.in); sc new Scanner(System.in) K = sc.nextLong() K sc.nextLong() sc.nextLong sc Long bank = 100L; bank 100L int toshi = 0; toshi 0 while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        } bank < K bank K {
            bank = (long)(bank * 1.01);
            toshi++;
        } bank = (long)(bank * 1.01) bank (long)(bank * 1.01) bank 1.01 toshi++ toshi System.out.println(toshi) System.out.println System.out System System.out toshi String[] args args public class Main {
    public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    }
} public class Main {
    public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    }
} Main
import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Long K;
        Scanner sc = new Scanner(System.in);
        K = sc.nextLong();
        Long bank = 100L;
        int toshi = 0;
        while( bank < K )
        {
            bank = (long)(bank * 1.01);
            toshi++;
        }
        System.out.println(toshi);
    }
}
