#include <iostream>
#include <cstdio>
using namespace std;
#define siz 10
int a[siz];
int fac(){
a[0]=a[1]=1;
for(int i=2;i<10;i++){
a[i]=i*a[i-1];
}
}
int main()
{
int n;
fac();
while(scanf("%d",&n)==1){
printf("%d\n",a[n]);
}
return 0;
}
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