diff --git a/xerbia.c b/xerbia.c
index 42803a4..208616b 100644
--- a/xerbia.c
+++ b/xerbia.c
@@ -1,87 +1,55 @@
 #include <xolatile/xtandard.c>
 
-static int wheat = 600,
-           gold  = 600,
-           wood  = 600,
-           stone = 600;
+enum { wheat,              gold,               wood,               stone,              resources            };
+enum { granary,            mine,               storehouse,         quarry,             constructions        };
 
-static int granaries   = 1,
-           mines       = 1,
-           storehouses = 1,
-           quarries    = 1;
+static int resource     [resources]     = { 600, 300, 300, 300 };
+static int construction [constructions] = {   1,   1,   1,   1 };
 
-static int check_resource (int have, int need, char * name) {
-	if (have < need) {
-		print ("You have only /3%i %s/- and you need /3%i/-, meaning that you miss /1%i/- more.\n", have, name, need, need - have);
+static char * resource_name     [] = { "wheat",            "gold",             "wood",             "stone"              };
+static char * construction_name [] = { "granary",          "mine",             "storehouse",       "quarry"             };
 
-		return (true);
+static int construction_cost [constructions] [resources] = {
+	{   0,  10,  60,  30 },
+	{   0, 120,  60,  10 },
+	{   0,  30,  10,  60 },
+	{   0,  60,  30,  10 }
+};
+
+static void build_construction (int index) {
+	int cost;
+
+	for (cost = 0; cost < resources; ++cost) {
+		if (resource [cost] < construction_cost [index] [cost]) {
+			print ("You have only /3%i %s/- and you need /3%i/-, meaning that you miss /1%i/- more.\n", resource [cost], resource_name [cost], construction_cost [index] [cost], construction_cost [index] [cost] - resource [cost]);
+			print ("Your architects humbly refused to build %s, while complaining about lacking the resources for that.\n", construction_name [index]);
+			return;
+		}
 	}
 
-	return (false);
-}
-
-static void build_granary (void) {
-	if (check_resource (gold, 10, "gold") || check_resource (wood, 60, "wood") || check_resource (stone, 30, "stone")) {
-		print ("Your architects humbly refused to build the /1granary/-, complaining about lacking the resources for that.\n");
-	} else {
-		gold  -= 10;
-		wood  -= 60;
-		stone -= 30;
-
-		print ("/2Granary/- that you ordered to be built was finished without issues, now you have /2%i/- granaries.\n", ++granaries);
+	for (cost = 0; cost < resources; ++cost) {
+		resource [cost] -= construction_cost [index] [cost];
 	}
-}
 
-static void build_mine (void) {
-	if (check_resource (gold, 120, "gold") || check_resource (wood, 60, "wood") || check_resource (stone, 30, "stone")) {
-		print ("Your architects humbly refused to build the /1mine/-, complaining about lacking the resources for that.\n");
-	} else {
-		gold  -= 120;
-		wood  -= 60;
-		stone -= 30;
+	construction [index] += 1;
 
-		print ("/2Mine/- that you ordered to be built was finished without issues, now you have /2%i/- mines.\n", ++mines);
-	}
-}
-
-static void build_storehouse (void) {
-	if (check_resource (gold, 30, "gold") || check_resource (wood, 10, "wood") || check_resource (stone, 60, "stone")) {
-		print ("Your architects humbly refused to build the /1storehouse/-, complaining about lacking the resources for that.\n");
-	} else {
-		gold  -= 30;
-		wood  -= 10;
-		stone -= 60;
-
-		print ("/2Storehouse/- that you ordered to be built was finished without issues, now you have /2%i/- storehouses.\n", ++storehouses);
-	}
-}
-
-static void build_quarry (void) {
-	if (check_resource (gold, 60, "gold") || check_resource (wood, 30, "wood") || check_resource (stone, 10, "stone")) {
-		print ("Your architects humbly refused to build the /1quarry/-, complaining about lacking the resources for that.\n");
-	} else {
-		gold  -= 60;
-		wood  -= 30;
-		stone -= 10;
-
-		print ("/2Quarry/- that you ordered to be built was finished without issues, now you have /2%i/- quarries.\n", ++quarries);
-	}
+	print ("Construction that you ordered to be built was finished without issues.\n", construction [index]);
 }
 
 static void print_resources (void) {
-	print ("Wheat = %i\n", wheat);
-	print ("Gold  = %i\n", gold);
-	print ("Wood  = %i\n", wood);
-	print ("Stone = %i\n", stone);
+	print ("Wheat = %i\n", resource [wheat]);
+	print ("Gold  = %i\n", resource [gold]);
+	print ("Wood  = %i\n", resource [wood]);
+	print ("Stone = %i\n", resource [stone]);
 }
 
 int main (void) {
 	print_resources ();
 
-	build_granary    ();
-	build_mine       ();
-	build_storehouse ();
-	build_quarry     ();
+	build_construction (granary);
+	build_construction (mine);
+	build_construction (storehouse);
+	build_construction (quarry);
 
 	print_resources ();