TongPhanThuc

#include <stdio.h>
#include <math.h>

int main()
{
long long i, n;
float tong = 1;
scanf("%lld", &n);
for (i = 2; i<=n ; ++i){
    tong = (tong + ((float)1)/i);
}
printf("%.4lf", tong);
return 0;
}