diff --git a/src/creep/builder.ts b/src/creep/builder.ts
index 3de1f89..f10c124 100644
--- a/src/creep/builder.ts
+++ b/src/creep/builder.ts
@@ -2,7 +2,6 @@ import { selectSource } from './common';
 
 interface BuilderMemory extends CreepMemory {
   building: boolean | undefined;
-  sourceId: Id<Source> | undefined;
 }
 
 export function runAsBuilder(creep: Creep) {
@@ -16,8 +15,8 @@ export function runAsBuilder(creep: Creep) {
     memory.building = true;
   }
 
-  if (memory.sourceId === undefined) {
-    memory.sourceId = selectSource(creep);
+  if (!memory.sourceId) {
+    memory.sourceId = selectSource(creep.room);
   }
 
   if (memory.building) {
diff --git a/src/creep/common.ts b/src/creep/common.ts
index 71764ed..d691b92 100644
--- a/src/creep/common.ts
+++ b/src/creep/common.ts
@@ -1,21 +1,29 @@
-import { randomValueFromArray } from '../utils/Random';
-
-export function selectSource(creep: Creep): Id<Source> {
-  const sources = creep.room.find(FIND_SOURCES);
-  const choices: Array<String> = [];
-  for (let source of sources) {
+export function selectSource(room: Room): Id<Source> {
+  console.log('Select source for room', room.name);
+  const creepsInRoom = room.find(FIND_MY_CREEPS);
+  const sourcesInRoom = room.find(FIND_SOURCES);
+  const rates: Weights = {};
+  for (let source of sourcesInRoom) {
+    const creepCount = creepsInRoom.filter((c) => c.memory.sourceId === source.id).length;
     const weight = getSourceWeight(source);
-    for (let i = 0; i < weight; ++i) {
-      choices.push(source.id);
-    }
+    rates[source.id] = creepCount / weight;
   }
-  console.log('Sources', choices);
-  return randomValueFromArray(choices) as Id<Source>;
+  console.log('Sources', JSON.stringify(rates));
+  return getKeyWithMinWeight(rates) as Id<Source>;
 }
 
-function getSourceWeight(source: Source) {
+function getSourceWeight(source: Source): number {
   const pos = source.pos;
   const terrains = source.room.lookForAtArea(LOOK_TERRAIN, pos.y - 1, pos.x - 1, pos.y + 1, pos.x + 1, true);
   const walked = terrains.filter((t) => t.terrain !== 'wall');
   return Math.max(walked.length - 1, 1);
 }
+
+interface Weights {
+  [key: string]: number;
+}
+
+function getKeyWithMinWeight(weights: Weights): string {
+  let keys = Object.keys(weights);
+  return keys.reduce((key, v) => (weights[v] < weights[key] ? v : key));
+}
diff --git a/src/creep/harvester.ts b/src/creep/harvester.ts
index 3e19fd8..dc2cd26 100644
--- a/src/creep/harvester.ts
+++ b/src/creep/harvester.ts
@@ -1,10 +1,6 @@
 import { selectSource } from './common';
 
-const TARGET_TYPES = [STRUCTURE_EXTENSION, STRUCTURE_SPAWN, STRUCTURE_TOWER];
-
-interface HarvesterMemory extends CreepMemory {
-  sourceId: Id<Source> | undefined;
-}
+const TARGET_TYPES = [STRUCTURE_EXTENSION, STRUCTURE_TOWER, STRUCTURE_SPAWN];
 
 enum Action {
   Harvest = 'harvest',
@@ -12,14 +8,14 @@ enum Action {
 }
 
 export function runAsHarvester(creep: Creep) {
-  const memory = creep.memory as HarvesterMemory;
+  const memory = creep.memory as CreepMemory;
 
   if (memory.action === undefined) {
     memory.action = Action.Harvest;
   }
 
-  if (memory.sourceId === undefined) {
-    memory.sourceId = selectSource(creep);
+  if (!memory.sourceId) {
+    memory.sourceId = selectSource(creep.room);
   }
 
   switch (memory.action) {
diff --git a/src/creep/upgrader.ts b/src/creep/upgrader.ts
index 034f7c0..176f7e0 100644
--- a/src/creep/upgrader.ts
+++ b/src/creep/upgrader.ts
@@ -2,7 +2,6 @@ import { selectSource } from './common';
 
 interface UpgraderMemory extends CreepMemory {
   upgrading: boolean | undefined;
-  sourceId: Id<Source> | undefined;
 }
 
 export function runAsUpgrader(creep: Creep) {
@@ -16,8 +15,8 @@ export function runAsUpgrader(creep: Creep) {
     memory.upgrading = true;
   }
 
-  if (memory.sourceId === undefined) {
-    memory.sourceId = selectSource(creep);
+  if (!memory.sourceId) {
+    memory.sourceId = selectSource(creep.room);
   }
 
   if (memory.upgrading) {
diff --git a/src/main.ts b/src/main.ts
index 2ede16a..db22187 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -20,8 +20,11 @@ function makeCreep(role: CreepRole, count: number) {
   if (creeps.length < count) {
     const firstSpawn = _.first(Object.values(Game.spawns));
     const name = makeName();
-    const memory = { role: role } as CreepMemory;
-    const err = firstSpawn.spawnCreep([WORK, WORK, CARRY, CARRY, MOVE, MOVE], name, { memory });
+    const memory = { role: role, sourceId: '' } as CreepMemory;
+    const err = firstSpawn.spawnCreep([WORK, WORK, CARRY, CARRY, MOVE, MOVE], name, {
+      memory,
+      directions: [BOTTOM, BOTTOM_RIGHT, RIGHT]
+    });
     console.log(`Make creep "${role}"`, 'err', err);
   }
 }
diff --git a/src/types.d.ts b/src/types.d.ts
index 0be1439..5bebc00 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -11,6 +11,10 @@ interface CreepMemory {
    * Действие, которое крип будет выполнять.
    */
   action: string | undefined;
+  /**
+   * Идентификатор источника энергии для крипа.
+   */
+  sourceId: Id<Source> | '';
   room: string;
   working: boolean;
 }