package main

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

func main() {
	reader := bufio.NewReader(os.Stdin)
	in, _ := reader.ReadString('\n')
	edition, _ := strconv.Atoi(strings.Trim(in, "\n"))
	fmt.Println(316 + (edition-1)*52)
}