package main

import "fmt"

func max(nums ...int) int {
	if len(nums) == 0 {
		panic("max: at least one argument required")
	}

	m := nums[0]
	for _, v := range nums[1:] {
		if v > m {
			m = v
		}
	}
	return m
}

func main() {
	fmt.Println(max(3, 7, 2, 9, 4))     // 9
	fmt.Println(max(-10, -5, -1, -100)) // -1
	fmt.Println(max(42))

	arr := []int{4, 5, 6}
	fmt.Println(max(arr...))
}