test2.py

def f(i):
    if i == 0:
        return 1
    else:
        return i * f(i - 1)

s = str(f(int(raw_input())))

i = len(s) - 1
while s[i] == "0":
    i -= 1

j = i
while s[j] != "0":
    j -= 1

print s[j + 1:i + 1]