#include<bits/stdc++.h>
using namespace std;
int main(){
	int m,k=0;
	double gl=0,gl2;
	cin >> m;
	while (gl<1){
		gl += 1.0/m;
		m --;
		k ++;
	}
	gl2-=1/m;
	if ((1-gl)==(1-gl2)){
		cout << --k;
	}else if ((1-gl)>(1-gl2)){
		cout << k;
	}else{
		cout << --k;
	}
	return 0;
}