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C. Number Transformation II

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputYou are given a sequence of positive integers *x*_{1}, *x*_{2}, ..., *x*_{n} and two non-negative integers *a* and *b*. Your task is to transform *a* into *b*. To do that, you can perform the following moves:

- subtract 1 from the current
*a*; - subtract
*a*mod*x*_{i}(1 ≤*i*≤*n*) from the current*a*.

Operation *a* mod *x*_{i} means taking the remainder after division of number *a* by number *x*_{i}.

Now you want to know the minimum number of moves needed to transform *a* into *b*.

Input

The first line contains a single integer *n* (1 ≤ *n* ≤ 10^{5}). The second line contains *n* space-separated integers *x*_{1}, *x*_{2}, ..., *x*_{n} (2 ≤ *x*_{i} ≤ 10^{9}). The third line contains two integers *a* and *b* (0 ≤ *b* ≤ *a* ≤ 10^{9}, *a* - *b* ≤ 10^{6}).

Output

Print a single integer — the required minimum number of moves needed to transform number *a* into number *b*.

Examples

Input

3

3 4 5

30 17

Output

6

Input

3

5 6 7

1000 200

Output

206

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