#include<iostream>
using namespace std;
int main()
{ int k;
cin>>k;
double Sn=0;
int i=0;
while(Sn<=k)
{i++;
Sn+=1.0/i;
}
cout<<i<<endl;
return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int k;
    cin >>k;
    int n = 1;
    double sn = 0;
    while(sn<=k)
    {
        
        sn+=(1.0/double(n));
        n+=1;
    }
    //cout << sn<<" ";
    cout <<n-1;//注意要减1
    return 0;
}

#include<iostream>
using namespace std;
int main()
{
    int k;
    double sn=0;
    cin >> k;
    for(int i=1;;i++)
    {
        sn+=1.0/i;
        if(sn>k)
        {
            cout << i;
            return 0;
        }
    }
}