import java.io.BufferedReader;
import java.io.InputStreamReader;

class Computation {
    public static void main(String[] args) throws java.io.IOException {
		    int iterations,numbertodivby; 
	            double computable = 0.0;
	            double timesran = 0.0;
		    BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
		    BufferedReader input2 = new BufferedReader(new InputStreamReader(System.in));
		    System.out.println("How many layers down will you go?");
		    iterations = Integer.parseInt(input.readLine());
		    

		    for(iterations=iterations;iterations>0;iterations--){
		    timesran++;
	            computable = (computable)+(1.0/timesran);
		    }
                    System.out.println("The sum is: " + computable);
    
    }


}
//By msglm; Licensed under the AGPL v3