local MOD=1000000007
local function add(a,b)return (a+b)%MOD end
local function sub(a,b)return (a-b)%MOD end
local function mul_(a,b)
	local ret=0
	while(b>0)do
		if(b%2==1)then ret=(ret+a)%MOD end
		a=(a+a)%MOD
		b=math.floor(b*.5)
	end
	return ret
end
local function mul(a,b)
	return a<b and mul_(b,a)or mul_(a,b)
end
local function pow(a,b)
	local ret=1
	while(b>0)do
		if(b%2==1)then ret=mul(ret,a)end
		a=mul(a,a)
		b=math.floor(b*.5)
	end
	return ret
end
local function inv(x)
	local a=x
	local b,u,v=MOD,1,0
	repeat
		local t=math.floor(a/b)
		a,b=b,a-t*b
		u,v=v,u-t*v
	until(b==0)
	return u%MOD
end
local function div(a,b)return mul(a,inv(b))end

N=io.read"*n"
r=1
for i=1,N do
	r=mul(r,i)
end
print(r)