diff --git a/zeta_python/1463.py b/zeta_python/1463.py
deleted file mode 100644
index c7d157e..0000000
--- a/zeta_python/1463.py
+++ /dev/null
@@ -1,32 +0,0 @@
-M = {1:0, 2:1, 3:1, 10:3}
-def ndp(n):
-    global M
-    stack = []
-    if n in M:
-        return M[n]
-    if n % 3 == 0:
-        stack.append((n, n//3))
-    if n %2 == 0:
-        stack.append((n, n//2))
-    stack.append((n, n-1))
-    while stack:
-        node = stack[-1]
-        if node[1] in M:
-            if node[0] in M:
-                if M[node[1]] + 1 < M[node[0]]:
-                    M[node[0]] = M[node[1]] + 1
-            else:
-                M[node[0]] = M[node[1]] + 1
-            stack.pop()
-            continue
-        if node[1] == 1:
-            M[node[0]] = 1
-            stack.pop()
-            continue
-        if node[1] % 3 == 0:
-            stack.append((node[1], node[1]//3))
-        if node[1] % 2 == 0:
-            stack.append((node[1], node[1]//2))
-        stack.append((node[1], node[1] - 1))
-    return M[n]
-print(ndp(int(input())))
\ No newline at end of file
diff --git a/zeta_python/completed/11053.py b/zeta_python/completed/11053.py
new file mode 100644
index 0000000..4892123
--- /dev/null
+++ b/zeta_python/completed/11053.py
@@ -0,0 +1,15 @@
+N = int(input())
+A = list(map(int, input().split()))
+
+T = [0 for _ in range(N)]
+T[0] = 1
+
+for i in range(1, N):
+    t = []
+    for j in range(i):
+        if A[j] < A[i]:
+            t.append(T[j] + 1)
+    else:
+        t.append(1)
+    T[i] = max(t)
+print(max(T))
diff --git a/zeta_python/completed/1463.py b/zeta_python/completed/1463.py
new file mode 100644
index 0000000..e055684
--- /dev/null
+++ b/zeta_python/completed/1463.py
@@ -0,0 +1,15 @@
+N = int(input())
+
+T = [0, ]
+
+for i in range(1, N):
+    new = i + 1
+    t = []
+    if new % 3 == 0:
+        t.append(T[new // 3 - 1] + 1)
+    if new % 2 == 0:
+        t.append(T[new // 2 - 1] + 1)
+    t.append(T[new - 1 - 1] + 1)
+    T.append(min(t))
+
+print(T[-1])
diff --git a/zeta_python/completed/1931.py b/zeta_python/completed/1931.py
new file mode 100644
index 0000000..543f097
--- /dev/null
+++ b/zeta_python/completed/1931.py
@@ -0,0 +1,13 @@
+N = int(input())
+I = [tuple(map(int, input().split())) for _ in range(N)]
+
+I.sort(key=lambda x: (x[1], x[0]))
+
+last = 0
+cnt = 0
+for i in range(N):
+    if last <= I[i][0]:
+        last = I[i][1]
+        cnt += 1
+
+print(cnt)
diff --git a/zeta_python/completed/2156.py b/zeta_python/completed/2156.py
new file mode 100644
index 0000000..3d43431
--- /dev/null
+++ b/zeta_python/completed/2156.py
@@ -0,0 +1,15 @@
+N = int(input())
+I = [int(input()) for i in range(N)]
+
+T = [[0 for _ in range(3)] for _ in range(N)]
+
+T[0][0] = 0
+T[0][1] = I[0]
+T[0][2] = 0
+
+for i in range(1, N):
+    T[i][0] = max((T[i-1][0], T[i - 1][1], T[i - 1][2]))
+    T[i][1] = T[i - 1][0] + I[i]
+    T[i][2] = T[i - 1][1] + I[i]
+
+print(max(T[-1]))