N=int(input())

if N>=60:
    print("0"*12)
    exit()
F=0
ANS=1
for i in range(2,N+1):
    ANS*=i
    if ANS>=10**13:
        F=1
    ANS%=10**12
ANS=str(ANS)

if F==0:
    print(ANS)
else:
    print("0"*(12-len(ANS))+ANS)