m = int(input())
a = m//3600
b = m%3600//60
c = m%60
h = ""
min = ""
s = ""
if a<10:
    h = "0"+str(a)
else:
    h = str(a)

if b<10:
    min = "0"+str(b)
else:
    min = str(b)

if c<10:
    s = "0"+str(c)
else:
    s = str(c)
print(h+":"+min+":"+s)

直接无脑

def convert_seconds_to_time(seconds):
    # 计算小时、分钟和秒
    hours = seconds // 3600
    minutes = (seconds % 3600) // 60
    secs = seconds % 60
    time_str = f"{hours:02}:{minutes:02}:{secs:02}"
    return time_str


input_seconds = int(input())
output_time = convert_seconds_to_time(input_seconds)
print(output_time)