diff --git a/2017/day15.py b/2017/day15.py
new file mode 100644
index 0000000..a59768d
--- /dev/null
+++ b/2017/day15.py
@@ -0,0 +1,39 @@
+import fileinput
+
+SEEDS = [int(l.split()[-1]) for l in fileinput.input()]
+
+FACTOR_A = 16807
+FACTOR_B = 48271
+MODULO = 2**31 - 1
+
+# Part 1
+gen_a, gen_b = SEEDS
+count = 0
+
+for i in range(40000000):
+    gen_a = (gen_a * FACTOR_A) % MODULO
+    gen_b = (gen_b * FACTOR_B) % MODULO
+
+    if (gen_a & 0xffff) == (gen_b & 0xffff):
+        count += 1
+
+print "Judge's first count:", count
+
+
+# Part 2
+gen_a, gen_b = SEEDS
+count = 0
+
+for i in range(5000000):
+    gen_a = (gen_a * FACTOR_A) % MODULO
+    while gen_a % 4 != 0:
+        gen_a = (gen_a * FACTOR_A) % MODULO
+
+    gen_b = (gen_b * FACTOR_B) % MODULO
+    while gen_b % 8 != 0:
+        gen_b = (gen_b * FACTOR_B) % MODULO
+
+    if (gen_a & 0xffff) == (gen_b & 0xffff):
+        count += 1
+
+print "Judge's second count:", count
diff --git a/2017/inputs/15.txt b/2017/inputs/15.txt
new file mode 100644
index 0000000..10e3bb0
--- /dev/null
+++ b/2017/inputs/15.txt
@@ -0,0 +1,2 @@
+Generator A starts with 679
+Generator B starts with 771
diff --git a/2017/outputs/15.txt b/2017/outputs/15.txt
new file mode 100644
index 0000000..54bab69
--- /dev/null
+++ b/2017/outputs/15.txt
@@ -0,0 +1,2 @@
+626
+306