01. Sum Seconds

package main
import "fmt"

func main() {
    var firstTime, secondTime, thirdTime int
    fmt.Scanln(&firstTime)
    fmt.Scanln(&secondTime)
    fmt.Scanln(&thirdTime)

    var total = firstTime + secondTime + thirdTime
    var minutes = total / 60
    var seconds = total % 60

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