#include<iostream> using namespace std; int a[10000100]; int main(){ int n,len=1,j; cin>>n; a[0] = 1; for(int i = 2; i <= n; i++){ a[0] *= i; j = 0; len = 0; while(a[j]){ a[j+1] += a[j]/10; a[j] %= 10; len++; } } cout<<n<<"!="; for(int i = len-1; i >= 0; i--){ cout<<a[i]; } return 0; }