#include <stdio.h>

int factorial(int n);

main() {
	int n;
	while(1) {
		scanf("%d", &n);
		printf("%d! =  %d\n", n, factorial(n));
	}
}

int factorial(int n) {
	int i, factorial = 1;
	for(i=1;i<=n;i++) {
		factorial = factorial * i;
	}
	return factorial;
}