.global main
main:
	mov $scanf_format, %rdi
	push %rax
	mov %rsp, %rsi
	xor %rax, %rax
	call scanf
	pop %r8 # This is the input
	mov %r8, %r9 # This is the accumulator

looptop:
	dec %r8
	imul %r8, %r9
	cmp $2, %r8
	jg looptop

# printing part
	mov $format,%rdi
	mov %r9, %rsi
	xor %rax, %rax
	call printf

	ret 

format:
	.asciz "%lu\n"

scanf_format:
	.asciz "%ld"