哪错了

#include <iostream>
#include <cstdio>
#include <cmath> 
using namespace std;
int main()
{
    int K,N;
    long double sum;
    cin>>k;
    sum=0;i=0;
    while (sum<=k)
    {
        N+=1;
        sum=sum+(1/N);
    }
    cout<<N<<endl; 
    return 0;
}