c++,编译提示超过时间，得分0？？？

#include <iostream>
using namespace std;
int main()
{
    int k,n;
    double sum;
    cin>>k;
    sum=0.0;
    n=0;
    while (sum<=k)
    {n=n+1;
    sum=sum+(1/n);}
    cout<<n;
    return 0;
}