A,B=map(int,input().split())
count=0
if A<B:
    small=A
    big=B
elif A>B:
    small=B
    big=A
else:
    count=A+B-1
if A!=B:
    big=big-1
    for i in range(1,big):
        if small-1>=0:
            count+=1
        else:
            break
        if big-1>=0:
            count+=1
        else :
            break
print(count)