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문제

You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn.

Write a program that:

  • reads the number of intervals, their end points and integers c1, ..., cn from the standard input,
  • computes the minimal size of a set Z of integers which has at least ci common elements with interval [ai, bi], for each i=1,2,...,n,
  • writes the answer to the standard output.

입력

The first line of the input contains an integer n (1 ≤ n ≤ 50000) -- the number of intervals. The following n lines describe the intervals. The (i+1)-th line of the input contains three integers ai, bi and ci separated by single spaces and such that 0 ≤ ai ≤ bi ≤ 50000 and 1 ≤ ci ≤ bi - ai+1.

출력

The output contains exactly one integer equal to the minimal size of set Z sharing at least ci elements with interval [ai, bi], for each i=1,2,...,n.

예제 입력

5
3 7 3
8 10 3
6 8 1
1 3 1
10 11 1

예제 출력

6

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