#include <iostream>

using namespace std;

int main(int argc, const char * argv[]) {
	for (int i = 5; i <= 30; i += 5)
	{
		double sum = 0;
		for (int k = 1; k <= 2<<i; k++)
		{
			sum += 1.0/k;
		}
		cout << "n = 2^" << i << ": " << sum << endl;
	}
	return 0;
}

n = 2^5: 4.74389
n = 2^10: 8.20208
n = 2^15: 11.6676
n = 2^20: 15.1333
n = 2^25: 18.599
n = 2^30: 0