#coding=utf-8
import pdb
def split_int( num ):
    #pdb.set_trace()
    if num < 2:
        result = 0
    elif num == 2:
        result == 1
    elif num == 3:
        result == 2
    else:
        dp = []
        dp.append(1)
        dp.append(2)
        dp.append(3)
        for i in range(2, num):
            current_max = -1
            for j in range(i//2):
                if dp[j] * dp[i - j] > current_max:
                    current_max = dp[j] * dp[i - j]
            dp.append(current_max)
        result = dp[-1]
    return result
if __name__ == "__main__":
    print (split_int(int(input())))