Given,

the total levels in a hill pattern (input1),

the weight of the head level (input2), and

the weight increments of each subsequent level (input3),

you are expected to find the total weight of the hill pattern.

"Total levels" represents the number of rows in the pattern.

"Head level" represents the first row.

Weight of a level represents the value of each star (asterisk) in that row.

The hill patterns will always be of the below format, starting with 1 star at head level and increasing 1 star at each level till level N.

```
*
**
***
****
*****
******
```

. . .and so on till level N

Example1 -

Given,

the total levels in the hill pattern = 5 (i.e. with 5 rows)

the weight of the head level (first row) = 10

the weight increments of each subsequent level = 2

Then, The total weight of the hill pattern will be calculated as = 10 + (12+12) + (14+14+14) + (16+16+16+16) + (18+18+18+18+18) = 10 + 24 + 42 + 64 + 90 = 230

Example2 -

Given,

the total levels in the hill pattern = 4

the weight of the head level = 1

the weight increments of each subsequent level = 5

Then, Total weight of the hill pattern will be = 1 + (6+6) + (11+11+11) + (16+16+16+16) = 1 + 12 + 33 + 64 = 110