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Contest: Task: Related: TaskA TaskC

Score : $400$ points

Problem Statement

One day, Snuke was given a permutation of length $N$, $a_1, a_2, ..., a_N$, from his friend.

Find the following:

Constraints

  • $1 ≦ N ≦ 200,000$
  • $(a_1, a_2, ..., a_N)$ is a permutation of $(1, 2, ..., N)$.

Input

The input is given from Standard Input in the following format:

$N$
$a_1$ $a_2$ $...$ $a_N$

Output

Print the answer.

Note that the answer may not fit into a 32-bit integer.

Sample Input 1

3
2 1 3

Sample Output 1

9

Sample Input 2

4
1 3 2 4

Sample Output 2

19

Sample Input 3

8
5 4 8 1 2 6 7 3

Sample Output 3

85