求助为何只有60分？

#include<iostream>
using namespace std;
int main()
{
    int k;
    cin>>k;
    float sn=0,n=1;
    while(sn<=k)
    {
        sn=sn+1.0/n;
        if(sn<=k)
            n++;    
    }
    cout<<n<<endl;
    return 0; 
}