include<bits/stdc++.h>

using namespace std; int main() {

int n;
cin >> n;
int num[100000];
num[0] = 1;
num[1] = 1;
for(int i = 2; i <= n; i++){
	int temp = 0;		
	for(int j = 1; j <= num[0]; j++){
		num[j] = num[j] * i + temp;
		temp = num[j] / 10;		
		num[j] = num[j] % 10;	
	}
	
	while(temp){
		num[0]++;	
		num[num[0]] = temp % 10;	
		temp = temp / 10;
	}
}

cout << n << "!=";
for(int i = num[0]; i >= 1; i--){
	cout << num[i];
}
return 0;

}