The package for this problem was not updated by the problem writer or Codeforces administration after we've upgraded the judging servers. To adjust the time limit constraint, a solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then the value 800 ms will be displayed and used to determine the verdict.

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
D. Lucky Pair

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputPetya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.

Petya has an array *a* of *n* integers. The numbers in the array are numbered starting from 1. Unfortunately, Petya has been misbehaving and so, his parents don't allow him play with arrays that have many lucky numbers. It is guaranteed that no more than 1000 elements in the array *a* are lucky numbers.

Petya needs to find the number of pairs of non-intersecting segments [*l*_{1};*r*_{1}] and [*l*_{2};*r*_{2}] (1 ≤ *l*_{1} ≤ *r*_{1} < *l*_{2} ≤ *r*_{2} ≤ *n*, all four numbers are integers) such that there's no such lucky number that occurs simultaneously in the subarray *a*[*l*_{1}..*r*_{1}] and in the subarray *a*[*l*_{2}..*r*_{2}]. Help Petya count the number of such pairs.

Input

The first line contains an integer *n* (2 ≤ *n* ≤ 10^{5}) — the size of the array *a*. The second line contains *n* space-separated integers *a*_{i} (1 ≤ *a*_{i} ≤ 10^{9}) — array *a*. It is guaranteed that no more than 1000 elements in the array *a* are lucky numbers.

Output

On the single line print the only number — the answer to the problem.

Please do not use the %lld specificator to read or write 64-bit integers in С++. It is preferred to use the cin, cout streams or the %I64d specificator.

Examples

Input

4

1 4 2 4

Output

9

Input

2

4 7

Output

1

Input

4

4 4 7 7

Output

9

Note

The subarray *a*[*l*..*r*] is an array that consists of elements *a*_{l}, *a*_{l + 1}, ..., *a*_{r}.

In the first sample there are 9 possible pairs that satisfy the condition: [1, 1] and [2, 2], [1, 1] and [2, 3], [1, 1] and [2, 4], [1, 1] and [3, 3], [1, 1] and [3, 4], [1, 1] and [4, 4], [1, 2] and [3, 3], [2, 2] and [3, 3], [3, 3] and [4, 4].

In the second sample there is only one pair of segments — [1;1] and [2;2] and it satisfies the condition.

Codeforces (c) Copyright 2010-2022 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/24/2022 06:32:00 (f1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|