# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	hr = 10; mn = 0
	a = int(input())
	hr += int(a // 100)
	mn += int((6 * a // 10) % 60)
	# print(hr, mn)
	if mn < 10:
		mn = "0" + str(mn)
	else:
		mn = str(mn)

	hr = str(hr)
	print(hr + ":" + mn)

if __name__ == '__main__':
	main()