#include <bits/stdc++.h>
using namespace std;
int main(){
    float x=0,n;
    cin>>n;
    for(double t=1;;t++){
        x+=1/t;
		if(x>=n){
			cout<<t;
			break;
		}  
    }
}
/**************************************************************
	Problem: 1078
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/