#define le 40
double d[le];
int age[le];
int k=10;
double max=1;
void reset()
{
int i=1;
for(;i<le;i++){d[i]=0;}
d[0]=1;
}
int t()
{
int i=le-1;
for(;i>0;i--) {if(d[i]>0)return i;}
return 0;
}
void pr()
{
	int i=0;
	int j=t();
	printf("%.0f",d[j]);
	if(j>0)for(i=j-1;i>=0;i--) {printf("%010.0f",d[i]);}
	puts("");
}
int f(int a)
{
if(a==0)return 0;
	int i;
	for(i=0;i<le;i++){age[i]=0;}
	for(i=0;i<le-1;i++) {
		d[i]*=a;
		if(d[i]>=max){
			age[i+1]=(int)(d[i]/max);
			d[i]=d[i]-age[i+1]*max;
		}
	}
	for(i=0;i<le-1;i++) {d[i]+=age[i];}
	return (a==1?a:f(a-1));
}


main(){char z[5];int a;for(a=0;a<k;a++)max*=10;while(gets(z)){reset();sscanf(z,"%d",&a);f(a);pr();}}