diff --git a/Josephus.py b/Josephus.py
new file mode 100644
index 0000000..119b0a7
--- /dev/null
+++ b/Josephus.py
@@ -0,0 +1,15 @@
+from sys import stdin
+
+def josephus(num,k):
+	if num <= 1:
+		return num
+	prev = 1
+	for i in xrange(2,num+1):
+		prev = ((prev+k-1)%i+1)
+	return prev
+
+while True:
+	N,D = map(int,stdin.readline().split())
+	if N == 0 and D == 0:
+		break
+	print josephus(N,D)