#! /usr/bin/awk -f

# /^(0[xX]?)?[0-9]+/ {
#	print const($0);
# }

function const(s ,a)
{
	split(s, a, "");
	return aconst(a);
}

# Uses Horner's method to evaluate number.

function aconst(a ,l,p,c,h,i,r)
{
	l = 0;
	while(a[++l]);
	if(l < 1)
		return; 
	i = 0;
	p = 1;
	r = 10;
	if (a[p] == "0") {
		r = 8;
		if (toupper(a[++p]) == "X") {
			r = 16;
			p++;
		}
	}
	while ((c = a[p++]) != "") {
		if ((h = toupper(c)) >= "A" && h <= "F")
			c = h - ("A" - 10);
		else if (c >= "0" && c <= "9")
			c -= "0";
		else
			break;
		if (c >= r)
			break;
		i = i * r + c;
	}
	return i;
}