#!/usr/bin/env python3


def maximize(a, b):
    if a > b:
        a, b = b, a
    return 2 * a - 1 + (1 if b - a > 0 else 0)


def main():
    a, b = (int(z) for z in input().split())
    res = maximize(a, b)
    print(res)


if __name__ == '__main__':
    main()