A,B = map(int,input().split())
def cake(a,b):
    if a>b:
        return b*2

    elif a == b:
        return b*2-1
 
    else:
        return (a-1)*2+1
  
if cake(A,B)  > cake(B,A)   :
    print(cake(A,B))
else:
    print(cake(B,A))