diff --git a/problems/P12781.py b/problems/P12781.py
new file mode 100644
index 0000000..4b8ad0c
--- /dev/null
+++ b/problems/P12781.py
@@ -0,0 +1,37 @@
+def ccw(first: list, second: list, third: list):
+    cross_porduct = (second[0] - first[0])*(third[1] - first[1]) - \
+        (third[0] - first[0])*(second[1] - first[1])
+    if cross_porduct > 0:
+        return 1
+    if cross_porduct < 0:
+        return -1
+    return 0
+
+
+def comparator(left: list, right: list):
+    if left[0] == right[0]:
+        return left[1] <= right[1]
+    return left[0] <= right[1]
+
+
+def solution(first: list, second: list):
+    first_scope = ccw(*first, second[0]) * ccw(*first, second[1])
+    second_scope = ccw(*second, first[0]) * ccw(*second, first[1])
+
+    if first_scope == 0 and second_scope == 0:
+        return False
+
+    return first_scope <= 0 and second_scope <= 0
+
+
+def test_solution():
+    assert solution([[0, 0], [6, 2]], [[5, -4], [2, 2]]) == True
+    assert solution([[-1, -5], [6, 3]], [[1, 10], [-4, -1]]) == False
+
+
+if __name__ == "__main__":
+    lines = list(map(int, input().split()))
+    if solution([lines[:2], lines[2:4]], [lines[4:6], lines[6:]]):
+        print(1)
+    else:
+        print(0)
diff --git a/problems/P17174.py b/problems/P17174.py
new file mode 100644
index 0000000..88f98b5
--- /dev/null
+++ b/problems/P17174.py
@@ -0,0 +1,16 @@
+def solution(amount: int, groupTO: int):
+    count = amount
+
+    while amount > 0:
+        amount //= groupTO
+        count += amount
+    return count
+
+
+def test_solution():
+    assert solution(13, 10) == 14
+    assert solution(100, 8) == 113
+
+
+if __name__ == "__main__":
+    print(solution(*map(int, input().split())))