n = int(input())
shi = 0
fen = 0
miao = 0
t = 0
# 如果n整除3600大于等于1,则取整赋值给shi,余数赋值给t,t再分两种情况分析,一种是大于等于60,另外就是小于60
if n // 3600 >= 1:
    shi = n // 3600
    t = n % 3600
    #余数大于60的情况
    if t // 60 >= 1:
        fen = t // 60
        miao = t % 60
    #余数小于60的情况
    else:
        miao = t
#n小于3600时
else:
    fen = n // 60
    miao = n % 60
#格式化输出
print('%02d:%02d:%02d' % (shi, fen, miao))
/**************************************************************
	Problem: 1081
	User: admin
	Language: Python
	Result: Accepted
	Time:87 ms
	Memory:34480 kb
****************************************************************/