#include<bits/stdc++.h>
using namespace std;
double n,s;
int x;
int main(){
    cin>>x;
    while(s<=x){
    	n++;
    	s=s+1/n;
	}
	cout<<n;
	return 0;       
}
/**************************************************************
	Problem: 1078
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/