**Steps**
1. Square the numbers that are greater than zero.
2. Multiply by 3 every third number.
3. Multiply by -1 every fifth number.
4. Return the sum of the sequence.
**Example**   
`{ -2, -1, 0, 1, 2 }` returns `-6`
```
1. { -2, -1, 0, 1 * 1, 2 * 2 }
2. { -2, -1, 0 * 3, 1, 4 }
3. { -2, -1, 0, 1, -1 * 4 }
4. -6
```
P.S.: The sequence consists only of integers. And try not to use "for", "while" or "loop" statements.
def calc(a):
    return sum(i**(1,2)[i>0]*(1,3)[idx%3==2]*(1,-1)[idx%5==4] for idx,i in enumerate(a))
def calc(a):
    return sum(i**(1,2)[i>0]*(1,3)[idx%3==2]*(1,-1)[idx%5==4] for idx,i in enumerate(a))