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## Problem Description

Rar the Cat has *N* cards, with unique labels 1 through *N*. He arranges them in some order in a row, where the *i*th card from the left is *A _{i}*.

Peanut comes in, and picks a random non-empty consecutive segment of cards. For each segment Peanut could pick, there exists a card with the minimum value. Find the sum of the minimum values among all possible segments Peanut could choose. Refer to the sample for more details.

## Input

The first line of input will contain one integer, *N*.

The next line of input will contain *N* integers, with the *i*th integer containing *A _{i}*.

## Output

The output should contain one integer, the sum of the minimum values among all possible segments.

## Limits

Subtask 1 (16%): 1 ≤ N ≤ 300.

Subtask 2 (30%): 1 ≤ N ≤ 2 000.

Subtask 3 (20%): 1 ≤ N ≤ 500 000, A will be in ascending order.

Subtask 4 (34%): 1 ≤ N ≤ 500 000.

Subtask 5 (0%): Sample Testcases

## Sample Testcase 1

### Input

3 2 1 3

### Output

9

### Explanation

The possible selections are [2], [1], [3], [2, 1], [1, 3], [2, 1, 3] with minimums 2, 1, 3, 1, 1, 1 respectively.

Therefore the answer is (2 + 1 + 3 + 1 + 1 + 1) = **9**.

## Sample Testcase 2

### Input

8 5 4 8 1 2 6 7 3

### Output

85

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 16 | 22 | 1s | 256MB | Minimum |

2 | 30 | 42 | 1s | 256MB | Minimum |

3 | 20 | 20 | 1s | 256MB | Minimum |

4 | 34 | 82 | 1s | 256MB | Minimum |

5 | 0 | 2 | 1s | 256MB | Minimum |

### Judge Compile Command

g++-7 ans.cpp -o cards -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512