## Problem Description

Peanut is helping Rar the Cat catch some mice in Cat-town. Cat-town can be modelled as a series of *N* nodes and *E* edges where each node represents a Mouse-house containing some number of mice *M*_{i}, and each edge represents a one-way conveyor belt Peanut can travel on (he is very lazy, so he can't walk). When Peanut reaches a Mouse-house with a certain number of mice, he can catch all the mice in the Mouse-house, and the Mouse-house would become empty. Peanut begins at node 0. Help Peanut find out what is the maximum number of mice he can catch.

## Input

The first line of input will contain two integers, *N* and *E*.

The second line of input will contain *N* integers, with the *i*th integer representing the number of mice in the Mouse-house at node *i*.

The next *E* lines of input will contain two integers each, with each line representing the two nodes the edge connects.

## Output

The output should contain one line containing one integer, the maximum number of mice Peanut can catch.

## Limits

All Mouse-houses will have less than 1 000 mice.

Subtask 1 (17%): 1 ≤ N, E ≤ 100.

Subtask 2 (21%): 1 ≤ N, E ≤ 3 000.

Subtask 3 (23%): 1 ≤ N, E ≤ 100 000. If there is a path from node X to node Y, there will not be a path from node Y to node X.

Subtask 4 (39%): 1 ≤ N ≤ 100 000. 1 ≤ E ≤ 500 000.

Subtask 5 (0%): Sample testcases.
## Sample Input 1

7 10
6 3 5 7 8 2 2
0 1
2 0
1 4
1 3
2 6
2 4
2 5
5 4
6 1
3 6

## Sample Output 1

26