text: # Challenge 1
  # Frequency addition
  
  input_file = "input.txt"
  starting_val = 0
  
  with open(input_file, "r") as f:
      for line in f.read().split('\n'):
          if len(line) < 2:
              pass
          elif line[0] == '+':
              starting_val += int(line[1:])
          elif line[0] == '-':
              starting_val -= int(line[1:])
  print(starting_val)
  