A, B = map(int, input().split())

a = max(A, B)
b = min(A, B)

if a == 0 and b == 0:
    print(0)
elif a == 0:
    print(2 * b - 1)
elif b == 0:
    print(2 * a - 1)
elif a == b:
    print(2 * a)
else:
    print(2 * b + 2 * (a - b) - 1)