diff --git a/zeta_python/completed/1167.py b/zeta_python/completed/1167.py
new file mode 100644
index 0000000..18021ea
--- /dev/null
+++ b/zeta_python/completed/1167.py
@@ -0,0 +1,47 @@
+import sys
+
+input = sys.stdin.readline
+
+
+def longest(E, start) -> tuple[int, int]:
+    D = []
+
+    M = 0
+    V_M = 0
+    D.append((start, [start], 0))  # now, visited, accumulated
+
+    while D:
+        now, visited, accumulated = D.pop(0)
+        flag = True
+        for e in E[now]:
+            target, cost = e[0], e[1]
+            if target not in visited:
+                flag = False
+                D.append((target, visited + [target], cost + accumulated))
+
+        if flag:
+            if accumulated > M:
+                M = accumulated
+                V_M = now
+
+    return V_M, M
+
+
+def solve(V, E):
+    first = longest(E, 1)[0]
+    _, diameter = longest(E, first)
+
+    return diameter
+
+
+if __name__ == "__main__":
+    V = int(input())
+    E = {}
+    for _ in range(V):
+        _i = list(map(int, input().split()))
+        E[_i[0]] = []
+
+        for i, v in zip(_i[1:-1:2], _i[2:-1:2]):
+            E[_i[0]].append((i, v))
+
+    print(solve(V, E))
diff --git a/zeta_python/completed/1629.py b/zeta_python/completed/1629.py
new file mode 100644
index 0000000..e132529
--- /dev/null
+++ b/zeta_python/completed/1629.py
@@ -0,0 +1,17 @@
+def solve(A, B, C) -> int:
+    A %= C
+    ret = 1
+    while B:
+        if B % 2 == 1:
+            ret *= A
+            ret %= C
+        A *= A
+        A %= C
+        B //= 2
+
+    return ret
+
+
+if __name__ == "__main__":
+    A, B, C = map(int, input().split())
+    print(solve(A, B, C))