GAPA
http://bg.wikipedia.org/wiki/%D0%93%D0%B0%D0%BF%D0%B0

var is_odd = function(n) {
	return ((n % 2) === 1);
};
var div_by_5_or_7 = function(n) {
	return (n % 5) === 0 &&
	       (n % 7) === 0;
};
var rect_area = function(width, height) {
	return width * height;
};
var third_7 = function(num) {
	var as_array = (num + "").toCharArray();
	var digit = as_array[as_array.length - 3];
	return digit === "7";
};
var bit_3 = function(num) {
	return ((num >> 4) % 2) === 1;
};
var in_circle = function(point) {
	var dx = point.x;
	var dy = point.y - 5;
	return (point.x*point.x + point.y*point.y) < 25;
};
var is_prime = function(n) {
	for(var ii = 2; ii <= Math.sqrt(n); ++ii) {
		if ((n % ii) == 0) {
			return true;
		}
	}
	return false;
};
var trapezoid_area = function(a, b, h) {
	return (a + b)*h/2;
};
var in_k_out_of_r = function(point) {
	var in_k = Math.pow(point.x - 1, 2) + Math.pow(point.y - 1, 2) < 9;
	var out_of_r = point.x <= -1 || point.x >= 5 ||
				   point.y >= 1 || point.y <= -1;
    return in_k && out_of_r;
};

//

var a = 10;
var b = 5;
if(a > b) {
	a -= b;  // a = a1 - b1
	b += a;  // b = b1 + a1 - b1 = a1
	a = b - a; // a = a1 - a1 + b1 = b1
};

var sign = function(a, b, c) {
	if(a == 0 || b == 0 || c == 0) {
		return 0;
	}
	if((a > 0) == (b > 0)) {
		return c;
	}

	return -c;
};

var biggest = function(a, b, c) {
	if(a >= b) {
		if(a >= c) {
			return a;
		}
		return c;
	}
	if(b >= c) {
		return b;
	}
	return c;
};

// six possible combinations
var sort_desc = function(a, b, c) {
	var ret = [a, b, c];
	if(a < b) {
		ret = [b, a, c];
		if(a < c) {
			ret = [b, c, a];
			if(b < c) {
				ret = [c, b, a];
			}
		}
	}
	else if(a < c) {
		ret = [c, a, b];
	}
	else if(c < b) {
		ret = [a, c, b];
	}
	return ret;
};

var digit_to_word = function(digit) {
	var ret = "";
	switch(digit % 10) {
		case 0: ret = "zero"; break;
		case 1: ret = "one"; break;
		case 2: ret = "two"; break;
		case 3: ret = "three"; break;
		case 4: ret = "four"; break;
		case 5: ret = "five"; break;
		case 6: ret = "six"; break;
		case 7: ret = "sevem"; break;
		case 8: ret = "eight"; break;
		case 9: ret = "nine"; break;
	}
	return ret;
};

var solve = function(a, b, c) {
	var D = -b + 4*a*c;
	if(D < 0) {
		return [];
	}
	if(D == 0) {
		return [-b/(2*a*c)];
	}
	return [(-b-D)/(2*a*c),(-b+D)/(2*a*c)];
};

var greatest_of_5(a, b, c, d, e) {
	var max = a;
	var arr = [b,c,d,e];
	for(var ii = 0; ii < 4; ++ii) {
		if(arr[ii] > max) {
			max = arr[ii];
		}
	}
	return max;
}