#include<bits/stdc++.h>
using namespace std;
const int MOD = 998244353;
namespace IO{//by cyffff
	char ibuf[(1<<20)+1],*iS,*iT;
	#if ONLINE_JUDGE
	#define gh() (iS==iT?iT=(iS=ibuf)+fread(ibuf,1,(1<<20)+1,stdin),(iS==iT?EOF:*iS++):*iS++)
 	#else
	#define gh() getchar()
	#endif
	#define reg register
	inline long long read(){
		reg char ch=gh();
		reg long long x=0;
		reg char t=0;
		while(ch<'0'||ch>'9')   t|=ch=='-',ch=gh();
		while(ch>='0'&&ch<='9') x=x*10+(ch^48),ch=gh();
		return t?-x:x;
	}
}
using IO::read;
int main(){
    long long ans = 1, n = read();
    for(int i = 3;i <= n; i++){
    	ans *= i;
    	ans %= (MOD);
	}
	cout << ans << endl;
}