#include <stdio.h>

int main () {
  int a = 0;
  int b = 0;
  
  int res = 0;
  
  int ans = 0;
  
  res = scanf("%d", &a);
  res = scanf("%d", &b);
  
  if (a > b) {
    int swap = a;
    a = b;
    b = swap;
  }
  
  ans = a+b;
  while (a > 0 && ans > 0) {
    a--;
    ans -= 2;
    if (ans < 0) {
      ans += 2;
    }
  }
  
  printf("%d\n", ans);
  return 0;
}