1 files changed, 19 insertions, 0 deletions
diff --git a/25/solution.py b/25/solution.py
new file mode 100644
index 0000000..6322ee4
--- /dev/null
+++ b/25/solution.py
@@ -0,0 +1,19 @@
+def part1(row, col):
+    row -= 1
+    col -= 1
+
+    n = row + col
+    n = n * (n + 1) // 2 + col
+
+    code = 20151125
+    for i in range(n):
+        code = code * 252533 % 33554393
+    return code
+
+if __name__ == '__main__':
+    row = 2978
+    col = 3083
+
+    print(part1(1, 1))
+    print(part1(3, 4))
+    print(part1(row, col))