diff --git a/zeta_cpp/1920.cpp b/zeta_cpp/completed/1920.cpp
similarity index 100%
rename from zeta_cpp/1920.cpp
rename to zeta_cpp/completed/1920.cpp
diff --git a/zeta_cpp/completed/2501.cpp b/zeta_cpp/completed/2501.cpp
new file mode 100644
index 0000000..3b12844
--- /dev/null
+++ b/zeta_cpp/completed/2501.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+int main() {
+    int count = 1;
+    int N, K;
+
+    cin >> N >> K;
+    if(K == 1) {
+        cout << 1 << endl;
+        return 0;
+    }
+    for(int i=2;i<=N;i++) {
+        if (N%i == 0) {
+            count += 1;
+            if (count == K) {
+                cout << i << endl;
+                break;
+            }
+        }
+    }
+    if (K > count) {
+        cout << 0 << endl;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_cpp/completed/9506.cpp b/zeta_cpp/completed/9506.cpp
new file mode 100644
index 0000000..b3e2a44
--- /dev/null
+++ b/zeta_cpp/completed/9506.cpp
@@ -0,0 +1,45 @@
+#include <iostream>
+#include <vector>
+#include <numeric>
+#include <algorithm>
+
+using namespace std;
+
+vector<int> isPerfect(int N) {
+    vector<int> v;
+    for (int i = 1; i < N; i++) {
+        if (N % i == 0) {
+            v.push_back(i);
+        }
+    }
+
+    int result = accumulate(v.begin(), v.end(), 0);
+    if (result == N) {
+        return v;
+    } else {
+        return vector<int>();
+    }
+
+}
+
+int main() {
+    int input;
+    vector<int> out;
+    cin >> input;
+    while (input != -1) {
+
+        out = isPerfect(input);
+        if (out.size() > 0) {
+            cout << input << " = " << out[0];
+            for (int i = 1; i < out.size(); i++) {
+                cout << " + " << out[i];
+            }
+            cout << endl;
+        } else {
+            cout << input << " is NOT perfect." << endl;
+        }
+        cin >> input;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/zeta_python/1967.py b/zeta_python/1967.py
new file mode 100644
index 0000000..e69de29
diff --git a/zeta_python/completed/1271.py b/zeta_python/completed/1271.py
new file mode 100644
index 0000000..6c88dda
--- /dev/null
+++ b/zeta_python/completed/1271.py
@@ -0,0 +1,4 @@
+a, b = map(int, input().split())
+
+print(a // b)
+print(a % b)
\ No newline at end of file
diff --git a/zeta_python/completed/1520.py b/zeta_python/completed/1520.py
new file mode 100644
index 0000000..38d4e5b
--- /dev/null
+++ b/zeta_python/completed/1520.py
@@ -0,0 +1,32 @@
+import sys
+
+sys.setrecursionlimit(1 << 16)
+
+
+def solve(M, N, U):
+    """get count of pathes"""
+
+    Mem = [[-1 for _ in range(N)] for _ in range(M)]
+    Mem[M - 1][N - 1] = 1
+
+    def dfs(now):
+        x, y = now
+        if Mem[x][y] != -1:
+            return Mem[x][y]
+        cnt = 0
+        for i, j in ((1, 0), (-1, 0), (0, 1), (0, -1)):
+            _x, _y = x + i, y + j
+            if 0 <= _x < M and 0 <= _y < N and U[_x][_y] < U[x][y]:
+                cnt += dfs((_x, _y))
+
+        Mem[x][y] = cnt
+        return Mem[x][y]
+
+    dfs((0, 0))
+    return Mem[0][0]
+
+
+if __name__ == '__main__':
+    M, N = map(int, input().split())
+    U = [list(map(int, input().split())) for _ in range(M)]  # U[m][n]
+    print(solve(M, N, U))
diff --git a/zeta_python/completed/16174.py b/zeta_python/completed/16174.py
new file mode 100644
index 0000000..59b3d28
--- /dev/null
+++ b/zeta_python/completed/16174.py
@@ -0,0 +1,33 @@
+def solve(N, A) -> bool:
+    now = (0, 0)
+    D = []
+    D.append(now)
+    X = [[0 for _ in range(N)]for _ in range(N)]
+    while D:
+        now = D.pop()
+        amount = A[now[0]][now[1]]
+        if X[now[0]][now[1]]:
+            continue
+        X[now[0]][now[1]] = 1
+        if amount == 0:
+            continue
+        elif amount == -1:
+            return True
+        if now[0] + amount >= N:
+            pass
+        else:
+            target = (now[0] + amount, now[1])
+            D.append(target)
+        if now[1] + amount >= N:
+            pass
+        else:
+            target = (now[0], now[1] + amount)
+            D.append(target)
+
+    return False
+
+
+if __name__ == '__main__':
+    N = int(input())
+    A = [list(map(int, input().split())) for _ in range(N)]
+    print("HaruHaru" if solve(N, A) else "Hing")
diff --git a/zeta_python/completed/2606.py b/zeta_python/completed/2606.py
new file mode 100644
index 0000000..99da080
--- /dev/null
+++ b/zeta_python/completed/2606.py
@@ -0,0 +1,30 @@
+def solve(N, X, E):
+    ComputerMap = {}
+    WormMap = [0 for i in range(N + 1)]
+    WormMap[1] = 1
+    for i in range(1, N + 1):
+        ComputerMap[i] = []
+    for e in E:
+        ComputerMap[e[0]].append(e[1])
+        ComputerMap[e[1]].append(e[0])
+
+    D = []
+    D.append(1)
+    while D:
+        x = D.pop()
+        connected = ComputerMap[x]
+        for conn in connected:
+            if WormMap[conn]:
+                continue
+            else:
+                WormMap[conn] = 1
+                D.append(conn)
+
+    return sum(WormMap) - 1
+
+
+if __name__ == '__main__':
+    N = int(input())
+    X = int(input())
+    E = list(sorted(list(map(int, input().split()))) for _ in range(X))
+    print(solve(N, X, E))