diff --git a/백준/1328.py b/백준/1328.py
new file mode 100644
index 0000000..289947e
--- /dev/null
+++ b/백준/1328.py
@@ -0,0 +1,14 @@
+import sys
+input = sys.stdin.readline
+
+N, L, R = map(int, input().split())
+
+D = [[[0 for i in range(101)] for j in range(101)] for k in range(101)]
+D[1][1][1] = 1
+
+for i in range(2, N+1):
+    for j in range(1, L+1):
+        for k in range(1, R+1):
+            D[i][j][k] = (D[i-1][j-1][k] + D[i-1][j][k-1] + (D[i-1][j][k] * (i-2)))%1000000007
+
+print(D[N][L][R])
\ No newline at end of file
diff --git a/백준/1377.py b/백준/1377.py
new file mode 100644
index 0000000..c12059b
--- /dev/null
+++ b/백준/1377.py
@@ -0,0 +1,18 @@
+import sys
+
+input = sys.stdin.readline().rstrip()
+arr = []
+temp = -500001
+n = int(input)
+
+for i in range(n):
+    num = int(sys.stdin.readline().rstrip())
+    arr.append((num, i))
+
+arr=sorted(arr)
+
+for i in range(n):
+    temp = max(temp, arr[i][1] - i)
+
+print(str(temp+1))
+
diff --git a/백준/1406.py b/백준/1406.py
new file mode 100644
index 0000000..a75d656
--- /dev/null
+++ b/백준/1406.py
@@ -0,0 +1,24 @@
+import sys
+
+A = sys.stdin.readline().rstrip()
+B = int(sys.stdin.readline().rstrip())
+
+pointer = len(A)
+
+for i in range(B):
+    tempstr = sys.stdin.readline().rstrip()
+    if(tempstr[0] == 'P'):
+        A = A[:pointer] + tempstr[2] + A[pointer:]
+        pointer+=1
+    elif(tempstr == 'L'):
+        if(pointer>0):
+            pointer-=1  
+    elif(tempstr == 'D'):
+        if(pointer<len(A)):
+            pointer+=1
+    else:
+        if(pointer>0):
+            A = A[:pointer-1] + A[pointer:]
+            pointer-=1
+
+print(A)
\ No newline at end of file
diff --git a/백준/1456.py b/백준/1456.py
new file mode 100644
index 0000000..50a8971
--- /dev/null
+++ b/백준/1456.py
@@ -0,0 +1,28 @@
+import sys
+import math
+
+input = sys.stdin.readline
+
+Min, Max = map(int, input().split())
+A = [0]*10000001
+
+for i in range(len(A)):
+    A[i] = i
+
+for i in range(2, int(math.sqrt(len(A)))+1):
+    if A[i]==0:
+        continue
+    for j in range(i+i, len(A), i):
+        A[j] = 0
+
+count = 0
+
+for i in range(2, 10000001):
+    if A[i]!= 0:
+        temp = A[i]
+        while A[i] <= Max / temp:
+            if A[i] >= Min / temp:
+                count +=1
+            temp = temp * A[i]
+
+print(count)
\ No newline at end of file
diff --git a/백준/1504.py b/백준/1504.py
new file mode 100644
index 0000000..facaa45
--- /dev/null
+++ b/백준/1504.py
@@ -0,0 +1,53 @@
+import sys
+import heapq
+
+sys.setrecursionlimit(10**6)
+input = sys.stdin.readline
+
+n, e = map(int, input().split()) #정점의 개수 N과 간선의 개수 E
+
+graph = [[] for _ in range(n+1)]
+distance = [sys.maxsize] * (n+1)
+start = 1
+
+for _ in range(e):
+    a, b, c = map(int, input().split())
+    graph[a].append((b, c))
+    graph[b].append((a, c))
+
+v1, v2 = map(int, input().split()) #반드시 들려야 하는 정점 위치
+
+for i in graph[v1]:
+    if(i[0]==v2):
+        v_weight = i[1]
+        break
+
+q = []
+
+
+def dijkstra(start):
+    distances = [sys.maxsize] * (n + 1)
+    distances[start] = 0
+    q = []
+    heapq.heappush(q, (0, start))
+
+    while q:
+        dist, now = heapq.heappop(q)
+        if distances[now] < dist:
+            continue
+        for nxt, weight in graph[now]:
+            cost = dist + weight
+            if cost < distances[nxt]:
+                distances[nxt] = cost
+                heapq.heappush(q, (cost, nxt))
+    return distances
+
+d1 = dijkstra(1)
+dv1 = dijkstra(v1)
+dv2 = dijkstra(v2)
+
+path1 = d1[v1] + dv1[v2] + dv2[n]
+path2 = d1[v2] + dv2[v1] + dv1[n]
+result = min(path1, path2)
+
+print(result if result < sys.maxsize else -1)