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problems = input()
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problems = problems.split(';')
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all_prob = []
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for problem in problems:
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if '-' in problem:
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start, stop = problem.split('-')
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for i in range(int(start), int(stop)+1):
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all_prob.append(i)
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else:
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all_prob.append(int(problem))
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print(len(set(all_prob)))
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