output_description: Output the amount of money each of Alice and Brown receive in a line.
input_description: The input is given in the following format.
  
      
      
      a b
      
  
  A line of data is given that contains two values of money: a (1000 ≤ a ≤
  50000) for Alice and b (1000 ≤ b ≤ 50000) for Brown.
attempt: print(int(sum(map(int, input().split())) / 2))
  
problem_description: Handsel
  
  Alice and Brown are brothers in a family and each receives pocket money in
  celebration of the coming year. They are very close and share the total amount
  of the money fifty-fifty. The pocket money each receives is a multiple of
  1,000 yen.
  
  Write a program to calculate each one’s share given the amount of money Alice
  and Brown received.
samples: [{"input": "1000 3000", "output": "2000"}, {"input": "5000 5000", "output": "5000"}, {"input": "1000 2000", "output": "1500"}]