You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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a,b =map(int, input().split(' '))
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nums=[]
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for i in range(b):
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m,n=map(int,input().split(' '))
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nums.extend(range(m,n+1))
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nums=set(nums)
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print(a+1-len(nums)) |
