#include <iostream>
using namespace std;

int main(){
  int n,k;
  cin>>n>>k;
  if(n%2==0){
    cout<<n/2<<endl;
    return 0;
  }
  int x;
  for(int i=n-1; i>0; --i){
    if(n%i==0){
      x=i;
      break;
    }
  }
  cout<<x<<endl;
  return 0;
}