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/* The Great Computer Language Shootout
http://shootout.alioth.debian.org/
contributed by Paul Lofte
*/
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class harmonic {
static final NumberFormat formatter = new DecimalFormat("#.000000000");
public static void main(String[] args) {
int n = 10000000;
if (args.length > 0) n = Integer.parseInt(args[0]);
double partialSum = 0.0;
for (int i=1; i<=n; i++) partialSum += 1.0/i;
System.out.println(formatter.format(partialSum));
}
}
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