21 lines
440 B
Python
21 lines
440 B
Python
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task_number = int(input())
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calculus = []
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for i in range(task_number):
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start, duration = [int(j) for j in input().split(' ')]
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calculus.append({
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'start': start,
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'end': start + duration - 1,
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})
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calculus.sort(key=lambda x: x['end'])
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selected = 1
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last_selected = calculus[0]
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for calc in calculus[1:]:
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if calc['start'] > last_selected['end']:
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selected += 1
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last_selected = calc
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print(selected)
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