secs = int(input())
h = int(secs / 3600) % 24
m = int(secs / 60 % 60)
s = int(secs % 60)

print(
    str("0" + str(h) if h < 9 else h) + ":" +
    str("0" + str(m) if m < 9 else m) + ":" +
    str("0" + str(s) if s < 9 else s)
)