
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x=sc.nextLong();
		long y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	}

} 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 y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x=sc.nextLong();
		long y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	} main {
		Scanner sc = new Scanner(System.in);
		long x=sc.nextLong();
		long y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long x=sc.nextLong(); x sc.nextLong() sc.nextLong sc long y=100; y 100 long cnt = 0; cnt 0 for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		} int i=0; int i=0; i 0 i<2 i 2 {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		} {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		} cnt+=1 cnt 1 y=(long) (y*1.01) y (long) (y*1.01) y 1.01 if(y>=x) {
				break;
			} y>=x y x {
				break;
			} break; System.out.println(cnt) System.out.println System.out System System.out cnt String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x=sc.nextLong();
		long y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	}

} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long x=sc.nextLong();
		long y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	}

} 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 y=100;
		long cnt = 0;
		for(int i=0;i<2;) {
			cnt+=1;
			y=(long) (y*1.01);
			if(y>=x) {
				break;
			}
		}
		System.out.println(cnt);
	}

}
