#include <bits/stdc++.h>
using namespace std;
int k;
int main(){
	cin>>k;
	for(int i=k+1;i<=1000000;i++){
		int t2=1,t3=2*k,cmt=0;
		while((t2+i-1)%t3>k || (t2+i-1)%t3==0){
			if((t2+i-1)%t3==0){
				cout<<i;
				return 0;
			}
			t2=(t2+i-1)%t3;
			t3-=1;
		}
	}
	return 0;
}

只过了一个点球球神牜帮帮我吧