diff --git a/run.py b/run.py
index 05a62ad..853a558 100644
--- a/run.py
+++ b/run.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import os
 import sys
 import pathlib
diff --git a/zeta_python/completed/10986.py b/zeta_python/completed/10986.py
new file mode 100644
index 0000000..e2d46fa
--- /dev/null
+++ b/zeta_python/completed/10986.py
@@ -0,0 +1,17 @@
+import sys
+import math
+
+input = sys.stdin.readline
+
+if __name__ == "__main__":
+    N, M = map(int, input().split())
+    A = list(map(int, input().split()))
+    S = [(0, 0)]
+    C = [0] * 1001
+    C[0] = 1
+    for i in range(N):
+        s = ((S[-1][0] + A[i]) % M, i + 1)
+        S.append(s)
+        C[s[0]] += 1
+
+    print(sum([math.comb(c, 2) for c in C]))
diff --git a/zeta_python/completed/11659.py b/zeta_python/completed/11659.py
new file mode 100644
index 0000000..ae9f069
--- /dev/null
+++ b/zeta_python/completed/11659.py
@@ -0,0 +1,13 @@
+import sys
+
+input = sys.stdin.readline
+
+if __name__ == "__main__":
+    N, M = map(int, input().split())
+    A = list(map(int, input().split()))
+    S = [0]
+    for i in range(N):
+        S.append(S[-1] + A[i])
+    for _ in range(M):
+        i, j = map(int, input().split())
+        print(S[j] - S[i - 1])
diff --git a/zeta_python/completed/11660.py b/zeta_python/completed/11660.py
new file mode 100644
index 0000000..b594aed
--- /dev/null
+++ b/zeta_python/completed/11660.py
@@ -0,0 +1,16 @@
+import sys
+
+input = sys.stdin.readline
+
+if __name__ == "__main__":
+    N, M = map(int, input().split())
+    A = [list(map(int, input().split())) for _ in range(N)]
+
+    S = [[0 for _ in range(N + 1)] for _ in range(N + 1)]
+    for i in range(N):
+        for j in range(N):
+            S[i + 1][j + 1] = S[i][j + 1] + S[i + 1][j] - S[i][j] + A[i][j]
+
+    for _ in range(M):
+        x1, y1, x2, y2 = map(int, input().split())
+        print(S[x2][y2] - S[x2][y1 - 1] - S[x1 - 1][y2] + S[x1 - 1][y1 - 1])