#include<iostream> using namespace std; int n; int Count,a[105]; bool used[105]; void print() { for(int k=1;k<=n;k++)cout<<a[k]; cout<<"\n"; Count++; } int dfs(int i) { if(i>n)print(); else for(int k=1;k<=n;k++) if(used[k]==0) { used[k]=1; a[i]=k; dfs(i+1); used[k]=0; } } int main() { int j; cin>>n; dfs(1); cout<<Count; }