#pragma warning(disable:4996)
#include<stdio.h>
int main()
{
  int i = 0;
  double z = 0.0;
  int n = 0;
  printf("请输入n：");
  scanf("%d", &n);
  for (i = 1;i <= n;i++)
  {
    z += 1.0 / i;
  }
  printf("前n项和为%lf\n", z);
  return 0;
}