package main

import (
	"fmt"
	"math"
)

func round(f float64) int {
	return int(math.Floor(f + .5))
}

func main() {
	var a int
	fmt.Scan(&a)
	m := round(float64(a) / float64(100) * 60)
	fmt.Printf("%02d:%02d\n", 10+m/60, m%60)
}