To'g'ri to'rtburchak perimetri

To'g'ri to'rtburchakning ikkita qo'shni tomoni a va b berilgan. Uning perimetrini toping.

func perimetri(a int, b int) float64 {
    // ...
}

Misollar

Input: a=5, b=3
Output: 16.0

Input: a=10, b=4
Output: 28.0

Input: a=7, b=7
Output: 28.0

Maslahatlar

1. P = 2 * (a + b)
2. Ikkala juft tomon ham bor: a va b. Avval ularning yig'indisini toping, keyin natijani 2 ga ko'paytiring.