#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define rep(i,a,b) for (int i=a; i<b; i++)
#define rrep(i,a,b) for(int i=a; i>=b; i--)
#define fore(i,a) for(auto &i:a)
#define pb push_back
#define _GLIBCXX_DEBUG
template <typename T> inline bool chmin(T& a, const T& b) {bool c=a>b; if(a>b) a=b; return c;}
template <typename T> inline bool chmax(T& a, const T& b) {bool c=a<b; if(a<b) a=b; return c;}
template <typename T> inline T gcd(T a,T b) {return (b==0)?a:gcd(b,a%b);}
template <typename T> inline T lcm(T a, T b) {return (a*b)/gcd(a,b);}
const int inf = INT_MAX / 2;
const ll infl = 1LL << 60;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vvvi = vector<vector<vector<int>>>;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;
using vvvll = vector<vector<vector<ll>>>;

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

  int a,b;
  cin >> a >> b;
  rep(i,1,100001){
    if(i % a == b % i){
      cout << i << endl;
      break;
    }
  }

  cout << fixed << setprecision(30);
  return 0;
}