#include <bits/stdc++.h>
using namespace std;
const int N=5e5+5;

int main(){
	long long k,jc=1,o=1;
	cin>>k;
	while(1){
		o*=jc;
		if(o%k==0){
			cout<<jc<<endl;
			break;
		}
		jc++;
		
	}
	return 0;
}