# factorial.py


n = int(input("Enter n: "))

fac = 1


for i in range(1, n+1):
    fac = fac * i

# print(n, "! = ", fac)
# print(n, "! = ", fac, sep="")

# print(n + "! = " + fac)
print(str(n) + "! = " + str(fac))