#include<bits/stdc++.h> using namespace std; int a[100000000],n,cnt=99999999,s,c; int main() { a[0]=1; cin>>n; for (int i=2;i<=n;i++) { c=0; for (int j=0;j<=n;j++) { s=a[j]*i+c; a[j]=s%10; c=s/10; } } cout<<n<<"!="; for(int i=99999999;i>=0;i--) { if(a[i]!=0) break; cnt--; } for (int i=cnt;i>=0;i--) { cout<<a[i]; } return 0; }