output_description: Print the answer.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
      A_1 B_1
      A_2 B_2
      :
      A_N B_N
attempt: a, b = input().split()
  print(int(a) * int(float(b) * 100) // 100)
  
problem_description: Statement
  
  There are N integers X_1, X_2, \cdots, X_N, and we know that A_i \leq X_i \leq
  B_i. Find the number of different values that the median of X_1, X_2, \cdots,
  X_N can take.
samples: [{"input": "2\n    1 2\n    2 3", "output": "3\n    \n\n  * If X_1 = 1 and X_2 = 2, the median is \\frac{3}{2};\n\n  * if X_1 = 1 and X_2 = 3, the median is 2;\n\n  * if X_1 = 2 and X_2 = 2, the median is 2;\n\n  * if X_1 = 2 and X_2 = 3, the median is \\frac{5}{2}.\n\nThus, the median can take three values: \\frac{3}{2}, 2, and \\frac{5}{2}.\n\n* * *"}, {"input": "3\n    100 100\n    10 10000\n    1 1000000000", "output": "9991"}]