Submission #4210440

---

Source Code Expand

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func nextString() string {
	if !sc.Scan() {
		panic("failed scan string")
	}
	return sc.Text()
}

func nextInt() int {
	if !sc.Scan() {
		panic("failed scan int")
	}
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func main() {
	sc.Split(bufio.ScanWords)

	k := nextInt()
	a := nextInt()
	b := nextInt()

	diff := b - a
	if diff <= 2 {
		fmt.Println(k + 1)
		return

	}
	first := a - 1
	if k < first+2 {
		fmt.Println(k + 1)
		return
	}
	rest := k - first
	times := rest / 2
	if rest%2 == 1 {
		fmt.Println(a + diff*times + 1)
	} else {
		fmt.Println(a + diff*times)
	}
}

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