a,b=map(int,input().split())
n=a+b
c=[]
if a>b:
  for i in range(a+b):
    if i%2==0:
      if a>0:
        c.append("a")
        a-=1
    else:
      if b>0:
        c.append("b")
        b-=1
      else:
        c.append("a")
        break
elif a==b:
  for i in range(a+b):
    if i%2==0:
      if a>0:
        c.append("a")
        a-=1
    else:
      if b>0:
        c.append("b")
        b-=1
elif a<b:
  for i in range(a+b):
    if i%2==0:
      if b>0:
        c.append("b")
        b-=1
    else:
      if a>0:
        c.append("a")
        a-=1
      else:
        c.append("b")
        break

ans=0
for i in range(1,n):
  if c[i]!=c[i-1]:
    ans+=1
print(ans)