from itertools import permutations
number = [str(x) for x in range(1,int(input())+1)]
p_numbers = permutations(number)
s = set()
for item in p_numbers:
    x = (len(item)//2)+(len(item)%2)
    if int(''.join(item[0:1])) * int(''.join(item[1:x])) == int(''.join(item[x:])):
        s.add(int(''.join(item[x:])))
    if len(item)>6 and int(''.join(item[0:2])) * int(''.join(item[2:x])) == int(''.join(item[x:])):
        s.add(int(''.join(item[x:])))
print(sum(s))