#include <algorithm> // min, max, swap, sort, reverse, lower_bound, upper_bound


#include <bitset>  // bitset
#include <cctype>  // isupper, islower, isdigit, toupper, tolower
#include <cmath>   // cmathライブラリをインクルード
#include <cstdint> // int64_t, int*_t
#include <cstdio>  // printf
#include <deque>   // deque
#include <iomanip>
#include <iostream>      // cout, endl, cin
#include <map>           // map
#include <queue>         // queue, priority_queue
#include <set>           // set
#include <stack>         // stack
#include <string>        // string, to_string, stoi
#include <tuple>         // tuple, make_tuple
#include <unordered_map> // unordered_map
#include <unordered_set> // unordered_set
#include <utility>       // pair, make_pair
#include <vector>        // vector
using namespace std;
//using namespace atcoder;
using ll = long long;
//using mint = modint998244353;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define Yout cout << "Yes" << '\n'
#define Nout cout << "No" << '\n'
#define pb push_back
#define mp make_pair
#define ft first
#define sd second
// #define _LIBCPP_DEBUG 0と書く必要があります。
const ll mod = 998244353;
const ll mod2 = (long long)1000000007;
const ll INF = (long long)2e18;
const vector<int> dx = {1, 0, -1, 0};
const vector<int> dy = {0, 1, 0, -1};
//  const vector<int> dx = {1, 1, 1, 0, -1, -1, -1, 0};
//  const vector<int> dy = {1, 0, -1, -1, -1, 0, 1, 1};
// const vector<int> dx = {1, -1, 1, -1};
// const vector<int> dy = {1, 1, -1, -1};

template <class T> void li(T a) {
  for (auto i : a) {
    cout << i << ' ';
  }
  cout << endl;
}

template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

bool ch(ll l, ll r, ll x) { return l <= x and x < r; }

bool chch(ll h, ll w, ll x, ll y) { return ch(0, h, x) and ch(0, w, y); }




void solve(){
	ll a,b ;cin >> a >> b;
	for(ll x=1;x<=100000;x++){
		if(x%a==b%x){cout << x << endl;return ;}
	}
	
}

int main(){
	solve();
}