#include<bits/stdc++.h>
using namespace std;
using Int = long long;

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n,k;
  cin>>n>>k;
  Int ans=0;
  for(Int i=1;i<=n;i++){
    if(n%i) continue;
    Int x=n/i;
    if(x<2) continue;
    chmax(ans,i);
  }
  cout<<ans<<endl;
  return 0;
}