# import sys; input = sys.stdin.buffer.readline # sys.setrecursionlimit(10**7) from collections import defaultdict con = 10 ** 9 + 7; INF = float("inf") def getlist(): return list(map(int, input().split())) #処理内容 def main(): A, B = getlist() if A == B: print(A + B - 1) else: ans = min(A + B) * 2 print(ans) if __name__ == '__main__': main()