def bit_plus_plus(total,operations): result = 0 for i in operations: if i == 'X++' or i == '++X': result = result + 1 else: result = result - 1 return result if __name__ == "__main__": total = int(input()) operations = [] for _ in range(0,total): operations.append(input()) print(bit_plus_plus(total,operations))