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#include <iostream>
using namespace std;
int main()
{
cout.flags(ios::fixed);
cout.precision(6); //设置输出精度
int n;
while (cin>>n)
{
double sum = 0;
for (int i = 1; i <= n; i++)
sum += 1.0 / i;
cout << sum << endl;
}
return 0;
}