output_description: Print "1" or "0" in a line.
input_description: g is given by coordinates of the points p1,..., pn in the following format:
  
      
      
      n
      x1 y1 
      x2 y2
      :
      xn yn
      
  
  The first integer n is the number of points. The coordinate of a point pi is
  given by two integers xi and yi. The coordinates of points are given in the
  order of counter-clockwise visit of them.
attempt: n = int(input())
  points = [complex(*map(int, input().split())) for _ in range(n)]
  edges = [p1 - p0 for p0, p1 in zip(points, points[1:] + [points[0]])]
  prev = edges[0]
  while edges:
      edge = edges.pop()
      if edge.real * prev.imag - prev.real * edge.imag < 1e-6:
          print(0)
          break
      prev = edge
  else:
      print(1)
  
problem_description: Is-Convex
  
    
  
  For a given polygon g, print "1" if g is a convex polygon, "0" otherwise.
  Here, in a convex polygon, all interior angles are less than or equal to 180
  degrees.
  
  g is represented by a sequence of points p1, p2,..., pn where line segments
  connecting pi and pi+1 (1 ≤ i ≤ n-1) are sides of the polygon. The line
  segment connecting pn and p1 is also a side of the polygon.
samples: [{"input": "4\n    0 0\n    3 1\n    2 3\n    0 3", "output": "1"}, {"input": "5\n    0 0\n    2 0 \n    1 1\n    2 2\n    0 2", "output": "0"}]