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23 lines
331 B
C++
23 lines
331 B
C++
#include <iostream>
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#include <iomanip>
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#include <cstring>
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#include <cstdio>
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#include <ctime>
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#include <cmath>
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using namespace std;
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int main(){
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int a;
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double sum=1;
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long long tem=1;
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scanf("%d",&a);
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for(int i=1;i<=a;i++){
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for(int j=1;j<=i;j++){
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tem*=j;
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}
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sum+=1*1.0/tem;
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tem=1;
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}
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printf("%.10lf",sum);
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return 0;
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}
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