def main():
    # parse problem information
    n, m = map(int, raw_input().strip().split())
    
    # calculate number of cuts
    if n > m:
        cuts = n - 1
        cuts += n * (m - 1)
    else:
        cuts = m - 1
        cuts += m * (n - 1)
    
    # final result
    print(cuts)


if __name__ == "__main__":
    main()