
"""simple docstring"""

from functools import reduce

_A						=			(
    '73167176531330624919225119674426574742355349194934'
    '96983520312774506326239578318016984801869478851843'
    '85861560789112949495459501737958331952853208805511'
    '12540698747158523863050715693290963295227443043557'
    '66896648950445244523161731856403098711121722383113'
    '62229893423380308135336276614282806444486645238749'
    '30358907296290491560440772390713810515859307960866'
    '70172427121883998797908792274921901699720888093776'
    '65727333001053367881220235421809751254540594752243'
    '52584907711670556013604839586446706324415722155397'
    '53697817977846174064955149290862569321978468622482'
    '83972241375657056057490261407972968652414535100474'
    '82166370484403199890008895243450658541227588666881'
    '16427171479924442928230863465674813919123162824586'
    '17866458359124566529476545682848912883142607690042'
    '24219022671055626321111109370544217506941658960408'
    '07198403850962455444362981230987879927244284909188'
    '84580156166097919133875499200524063689912560717606'
    '05886116467109405077541002256983155200055935729725'
    '71636269561882670428252483600823257530420752963450'
)
def 		UpperCAmelCase (		a_ = N      ):





		'''simple docstring'''


		return max(
		    # mypy cannot properly interpret reduce
		    int(reduce(lambda a_,						a_      : str(int(a_      ) * int(a_      )      ),						n[i : i + 13]      )      )
		    for i in range(len(a_      ) - 12      )      )


if __name__ == "__main__":
					print(F"""{solution() = }""")








"""simple docstring"""

def 		UpperCAmelCase (		):





		'''simple docstring'''


		return 1
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else two_pence(x - 2      ) + one_pence()
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else five_pence(x - 5      ) + two_pence(a_      )
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else ten_pence(x - 10      ) + five_pence(a_      )
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else twenty_pence(x - 20      ) + ten_pence(a_      )
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else fifty_pence(x - 50      ) + twenty_pence(a_      )
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else one_pound(x - 100      ) + fifty_pence(a_      )
def 		UpperCAmelCase (		a_      ):





		'''simple docstring'''


		return 0 if x < 0 else two_pound(x - 200      ) + one_pound(a_      )
def 		UpperCAmelCase (		a_ = 200      ):





		'''simple docstring'''


		return two_pound(a_      )


if __name__ == "__main__":
					print(solution(int(input().strip())))






