类似 Fibonnaci，DP
//============================================================================
// Name : Sweet Child Makes Trouble.cpp
// Date : 2013/4/4 下午7:18:23
// Author : GCA
//============================================================================
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <climits>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <cctype>
#include <utility>
using namespace std;
#ifdef ONLINE\_JUDGE
#define ll "%lld"
#else
#define ll "%I64d"
#endif
typedef unsigned int uint;
typedef long long int Int;
#define Set(a,s) memset(a,s,sizeof(a))
#define Write(w) freopen(w,"w",stdout)
#define Read(r) freopen(r,"r",stdin)
#define Pln() printf("\\n")
#define I\_de(x,n)for(int i=0;i<n;i++)printf("%d ",x\[i\]);Pln()
#define De(x)printf(#x"%d\\n",x)
#define For(i,x)for(int i=0;i<x;i++)
#define CON(x,y) x##y
#define Pmz(dp,nx,ny)for(int hty=0;hty<ny;hty++){for(int htx=0;htx<nx;htx++){\\
printf("%d ",dp\[htx\]\[hty\]);}Pln();}
#define M 1005
#define PII pair<int,int\>
#define PB push\_back
#define oo INT\_MAX
#define Set\_oo 0x3f
#define Is\_debug true
#define debug(...) if(Is\_debug)printf("DEBUG: "),printf(\_\_VA\_ARGS\_\_)
#define FOR(it,c) for(\_\_typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define eps 1e-6
bool xdy(double x,double y){return x>y+eps;}
bool xddy(double x,double y){return x>y-eps;}
bool xcy(double x,double y){return x<y-eps;}
bool xcdy(double x,double y){return x<y+eps;}
int min3(int x,int y,int z){
int tmp=min(x,y);
return min(tmp,z);
}
int max3(int x,int y,int z){
int tmp=max(x,y);
return max(tmp,z);
}
int step\[M\]\[2000\];
char print\[M\]\[2000\];
void init(){
Set(step,0);
Set(print,0);
step\[0\]\[0\]=1;
step\[0\]\[1\]='';
step\[1\]\[0\]=0;
step\[1\]\[1\]='';
for(int i=2;i<801;i++){
for(int j=0;j<2000;j++){
step\[i\]\[j\]+=(step\[i-1\]\[j\]+step\[i-2\]\[j\])\*(i-1);
step\[i\]\[j+1\]+=step\[i\]\[j\]/10;
step\[i\]\[j\]%=10;
// printf("%d",step\[i\]\[j\]);
}
// Pln();
int k;
// debug("%d\\n",i);
for(k=1999;k>=0;k--){
if(step\[i\]\[k\]>0)break;
}
int j;
for(j=0;k>=0;k--,j++){
print\[i\]\[j\]=step\[i\]\[k\]+'0';
}
print\[i\]\[j\]='';
}
}
int main() {
ios\_base::sync\_with\_stdio(0);
int x;
init();
while(~scanf("%d",&x)&&x!=-1){
if(x==0)printf("1\\n");
else if(x==1)printf("0\\n");
else{
printf("%s\\n",print\[x\]);
}
}