a = int(input())
time = (10*60 + a*60//100)%1440
h = "0" + str(time//60) if len(str(time//60)) == 1 else str(time//60)
m = "0" + str(time - time//60*60) if len(str(time - time//60*60)) == 1 else str(time - time//60*60)
print(h+":"+m)