# Enter your code here. Read input from STDIN. Print output to STDOUT
s=map(int,raw_input().split())
a=0
b=0
if s[0]>1:
    a=s[0]-1
else:
    a=0
if s[1]>0:
    b=s[1]-1
else:
    b=0


t=0
t=a+b
print (t)