package main

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

func decToBin(n int64) string {
	var bin string
	for n > 0 {
		if n%2 == 1 {
			n--
			n /= 2
			bin = "1" + bin
		} else {
			n /= 2
			bin = "0" + bin
		}
	}
	return bin
}

func main() {
	reader:= bufio.NewReader(os.Stdin)
	fmt.Printf("Enter a decimal nuber\n")
	input, _ := reader.ReadString('\n')
	dec, _ := strconv.ParseInt(strings.TrimSpace(input),10, 64)
	fmt.Printf("The binary number is: %s\n",decToBin(dec))
}