Inaho has arrived at the gates to return to his petty -dimensional world, but the gates are locked! He wants to get home as quickly as possible to continue playing his *Graph Simulater 2015*, that is within seconds, but the gates are preventing him from leaving. On the gates are nonpositive integers, and he believes finding the sum will allow him back into his -dimensional world. Of course, he is still stuck in the -dimensional hole, and therefore cannot comprehend the complexities of -dimensions, so he needs your help again.

#### Input Specification

The first line will contain the integer , the number of integers on the gates.

The second line will contain space-separated nonpositive integers,

#### Subtasks

For 1 of the 3 available marks,

#### Output Specification

Output the sum of the nonpositive integers.

#### Sample Input 1

```
2
-1 -4
```

#### Sample Output 1

`-5`

#### Sample Input 2

```
5
-4503599627370496 -4503599627370496 -4503599627370496 -4503599627370496 -4503599627370496
```

#### Sample Output 2

`-22517998136852480`

## Comments