03. Time + 15 Minutes

package main
import "fmt"

func main() {
    var hour, minute int
    fmt.Scanln(&hour)
    fmt.Scanln(&minute)

    var totalMinutes = hour * 60 + minute + 15
    var hours = totalMinutes / 60 % 24
    var minutes = totalMinutes % 60

    fmt.Printf("%d:%02d\n", hours, minutes)
}