package main

import "fmt"

func number() {

	var n int
	var s string
	fmt.Println("Number:")
	_, _ = fmt.Scanf("%d", &n)
	fmt.Println("Sum or product?")
	_, _ = fmt.Scanf("%s", &s)

	if s == "sum" {

		var sum int = 0

		for i := 1; i <= n; i++ {

			sum += i

		}

		fmt.Println(sum)

	} else if s == "product" {

		var pro int = 1

		for i := 1; i <= n; i++ {

			pro = pro * i

		}

		fmt.Println(pro)

	}

}

func main() {

	number()

}