#include<iostream>

using namespace std;

int aa(int i){
	
	if(i==0){
	return 1 ; 
	}
	else{
	return (i*aa(i-1)) ; 
}

}

int main(){
	int a = 5 ;
	for(int c = 0; c <= a; c++){
	cout << c << "!=" << aa(c) <<  endl ;
	}

}