diff --git a/code_study/Baekjoon/python/17404.py b/code_study/Baekjoon/python/17404.py
index 2ae0d30..3ae2e98 100644
--- a/code_study/Baekjoon/python/17404.py
+++ b/code_study/Baekjoon/python/17404.py
@@ -17,21 +17,23 @@ for _ in range(N) :
 result = []
 
 for i in range(3) :
-    dpR = [maxCost if i != 0 else R[0]]
-    dpG = [maxCost if i != 1 else G[0]]
-    dpB = [maxCost if i != 2 else B[0]]
+    prevR = maxCost if i != 0 else R[0]
+    prevG = maxCost if i != 1 else G[0]
+    prevB = maxCost if i != 2 else B[0]
     
     for n in range(1, N) :
         r, g, b = R[n], G[n], B[n]
-        dpR.append(r + min(dpG[n-1], dpB[n-1]))
-        dpG.append(g + min(dpR[n-1], dpB[n-1]))
-        dpB.append(b + min(dpR[n-1], dpG[n-1]))
+        curR = r + min(prevG, prevB)
+        curG = g + min(prevR, prevB)
+        curB = b + min(prevR, prevG)
+        
+        prevR, prevG, prevB = curR, curG, curB
     
     if i==0 :
-        result.append(min(dpG[N-1], dpB[N-1]))
+        result.append(min(prevG, prevB))
     elif i==1 :
-        result.append(min(dpR[N-1], dpB[N-1]))
+        result.append(min(prevR, prevB))
     else :
-        result.append(min(dpR[N-1], dpG[N-1]))
+        result.append(min(prevR, prevG))
 
 print(min(result))
\ No newline at end of file