18 lines
211 B
C++
18 lines
211 B
C++
#include<cstdio>
|
|
using namespace std;
|
|
int main()
|
|
{
|
|
int n;
|
|
long long times=1;
|
|
double ans=0;
|
|
scanf("%d",&n);
|
|
for(int i=1;i<=n;i++)
|
|
{
|
|
times*=i;
|
|
ans+=1.0/times;
|
|
}
|
|
printf("%.10lf\n",ans+1);
|
|
return 0;
|
|
}
|
|
|