import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
	
     Scanner input = new Scanner(System.in);
     
     double n,k,i,j,f;
     k = input.nextDouble();
     n = 1; f = 0;
     for(i = 1;n <= i; i++) {
    	 j = (double)1/n;
    	 f = (double)(f + j);
     if(f>k) {
    	 System.out.println(n);
    	 break;
     } else {n++;}
     
     
     }
	}

}
结果没问题但全是wa