Deer of Santa

package main

import (
  "fmt"
  "math"
)

func main() {
    var days int
    fmt.Scanln(&days)

    var availableFood, deer1, deer2, deer3 float64
    fmt.Scanln(&availableFood)
    fmt.Scanln(&deer1)
    fmt.Scanln(&deer2)
    fmt.Scanln(&deer3)

    availableFood -= (deer1 + deer2 + deer3) * float64(days)

    if availableFood >= 0 {
        fmt.Printf("%d kilos of food left.", int(math.Floor(availableFood)))
    } else {
        fmt.Printf("%d more kilos of food are needed.", int(math.Ceil(math.Abs(availableFood))))
    }
}