/*
g++ --std=c++17 B.cpp
*/

#include <iostream>
#include <iomanip> //! for setprecision(20)
#include <math.h>
#include <algorithm>
#include <functional> 
#include <string>
#include <vector>

#include <cstring>
#include <set>
#include <map>
#include <queue>
#include <utility>
#include <limits.h>
#include <atcoder/all>

using namespace std;
using namespace atcoder;

typedef long long LL;

#define rep(i,n) for (int i = 0; i < int(n); ++i)
#define dump(c) { for (auto it = c.begin(); it != c.end(); ++it) if (it == c.begin()) cout << *it; else cout << ' ' << *it; cout << endl; } 
#define dumpMap(m) { for (auto it: m) cout << it.first << "=>" << it.second << ' '; }

const int INF = 1000000000;
const int MOD = 1000000007;
using mint = static_modint<MOD>;

/*
  == AC Library Cheat sheet
  documentation: file:///Users/nobu/Downloads/ac-library/document_ja/index.html

  mint
    mint m.pow(int p)  //! return m^p
    mint m.inv() //! returns i that gives (m * i).val() == 1 
    int m.val() 

  fenwick_tree (BIT)
    fenwick_tree<T> fw(int n) //! init a[0] .. a[n-1] with all 0
    void fw.add(int idx, T x); //! a[idx] += x
    T fw.sum(int l, int r); //! return a[l] + .. + a[r-1]

  dsu (UnionFind)
    dsu d(int n)  //! prepare dsu with n nodes
    void d.merge(int x, int y)  //! connect node x and y
    bool d.same(int x, int y)  //! return true if node x and y are connected
    int d.leader(int x)  //! return the leader node of the connected group
    int d.size(int x) //! return the size of the group that node x belongs to
    vector<vector<int>> d.groups() //! return a vector of vectors that contain the nodes in each group

  scc_graph
    scc_graph　g(int n)  //! create a directed graph with n nodes
    g.add_edge(int from, int to)  //! create a directed edge from node from to node to
    vector<vector<int>> g.scc()  //! return the vector of strongly connected components that are topologically sorted

  segtree
    segtree<S, op, e>
      S: type of the monoid 
      op: function to return the product of two elements
      e: function to return the identity element such that op(x, e) == x fo any x 

  lazy_segtree
    lazy_segtree<S, op, e, F, mapping, composition, id>
      F: type of parameters to define the operation applied to the target elements
      mapping: function to return the element after applying the operation to the target element
      composition: function to combine the two sets of operation parameters to one
      id: function to return the operation parameter i such that mapping(i, x) = x for any x

      using S = int;
      S op(S a, S b) { return min(a, b); }
      S e() { return INF; }
      using F = int;
      S mapping(F f, S x) { return min(f, x); }
      F composition(F f, F g) { return min(f, g); }
      F id() { return INF; }

  floor_sum(ll n, ll m, ll a, ll b)   
*/



int main()
{
  cin.tie(0);
  ios::sync_with_stdio(0);

  LL n;
  cin >> n;
  vector<LL> f;
  f.push_back(2);
  for (LL x = 2; x*x <= n; ++x) {
    while (n % x == 0) {
      f.push_back(x);
      n /= x;
    }
  }
  if (1 < n) {
    f.push_back(n);
  }

  //! find the minimum k such that k*(k+1) = products of elements in f * some integer
  LL ans = 1e18;
  vector<LL> r(2), m(2);
  r[0] = 0;
  r[1] = -1;
  rep(i, 1 << f.size()) {
    LL x = 1;
    LL y = 1;
    rep(b, f.size()) {
      if (i & (1 << b)) {
        x *= f[b];
      } else {
        y *= f[b];
      }
    }
    m[0] = x;
    m[1] = y;

    auto z = crt(r, m);
    if (z.first && z.second) {
      ans = min(ans, z.first);
    }
  }

  cout << ans << endl;

  return 0;
}


Measured memory_bytes: 3660