#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

#define CIN_ONLY if(1)
struct cww{cww(){
    CIN_ONLY{
        ios::sync_with_stdio(false);cin.tie(0);
    }
}}star;
#define fin "\n"
#define FOR(i,bg,ed) for(int i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
#define pb push_back
#define DEBUG if(0)
#define REC(ret, ...) std::function<ret (__VA_ARGS__)>
template <typename T>inline bool chmin(T &l,T r)
{bool a=l>r;if(a)l=r;return a;}
template <typename T>inline bool chmax(T &l,T r)
{bool a=l<r;if(a)l=r;return a;}
template <typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}
typedef __int128 INT;
int main(){
    LL N;
    cin>>N;
    INT ret=1;
    int dig=0;
    const LL mod=1e12;
    FOR(i,1,min(1000ll,N+1)) {
        ret=ret*i;
        if(ret>=mod)dig=1;
        ret%=mod;
    }
    string s=to_string((LL)ret);
    if(dig)while(s.size()<12)s="0"+s;
    cout<<s<<endl;
    return 0;
}