/* -*- coding: utf-8 -*-
 *
 * 3498.cc:  No.3498 Modulo Equation - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int a, b;
  scanf("%d%d", &a, &b);

  int maxx = a + b;
  for (int x = 1; x <= maxx; x++)
    if (x % a == b % x) { printf("%d\n", x); break; }

  return 0;
}