import java.util.Scanner; public class Main{

public static void main(String[]args){
    Scanner sc = new Scanner(System.in);
    float a = sc.nextFloat();
    int times = 0;
    float result = 1000000;
    while(result<2000000){
        result += result*a;
        times++;
    }
    System.out.println(times);
}

}