Family Trip

package main

import (
  "fmt"
  "math"
)

func main() {
    var overnights, additionalCosts int
    var budget, overnightPrice float64
    fmt.Scanln(&budget)
    fmt.Scanln(&overnights)
    fmt.Scanln(&overnightPrice)
    fmt.Scanln(&additionalCosts)

    if overnights > 7 {
        overnightPrice *= 0.95
    }

    budget -= overnightPrice * float64(overnights) + 0.01 * budget * float64(additionalCosts)

    if budget >= 0 {
        fmt.Printf("Ivanovi will be left with %.2f leva after vacation.\n", budget)
    } else {
        fmt.Printf("%.2f leva needed.\n", math.Abs(budget))
    }
}