diff --git a/bit_difference.py b/bit_difference.py
new file mode 100644
index 0000000..f6fe3f0
--- /dev/null
+++ b/bit_difference.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+import sys
+
+def xor_count(a, b):
+    xor = a ^ b
+    i = 0
+    while xor != 0:
+        i = i + (xor & 1)
+        xor = xor >> 1
+    return i
+
+
+def bitwise_difference(A):
+    s = 0
+    for i in range(len(A)):
+        for j in range(i+1,len(A)):
+            s = s + xor_count(A[i], A[j])
+    return s
+
+
+if __name__ == "__main__":
+    sys.stdin.readline()
+    A = sys.stdin.readline().split()
+    for i in range(len(A)):
+        A[i] = int(A[i])
+
+    print(bitwise_difference(A))
diff --git a/bit_difference.txt b/bit_difference.txt
new file mode 100644
index 0000000..4406f67
--- /dev/null
+++ b/bit_difference.txt
@@ -0,0 +1,2 @@
+6
+34 10 52 84 0 71
diff --git a/counting_sheep.py b/counting_sheep.py
new file mode 100755
index 0000000..a71db4d
--- /dev/null
+++ b/counting_sheep.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+import sys
+import math
+
+def digits(A, n):
+    if n == 0:
+        A[0] = True
+        return
+
+    while n != 0:
+        A[n % 10] = True
+        n = n // 10
+
+
+def check(A):
+    n = 0
+    for i in range(10):
+        if A[i]:
+            n = n + 1
+    return n == 10
+
+
+def count_sheep(start):
+    if start == 0:
+        return "INSOMNIA"
+
+    A = [False,False,False,False,False,False,False,False,False,False]
+
+    n = start
+    while True:
+        digits(A, n)
+        if check(A):
+            return str(n)
+        n += start
+
+    return "INSOMNIA"
+
+
+if __name__ == "__main__":
+    i = 0
+    for line in sys.stdin:
+        if i == 0:
+            i = i + 1
+            continue
+        print('Case #' + str(i) + ": " + count_sheep(int(line)))
+        i = i + 1
diff --git a/counting_sheep.txt b/counting_sheep.txt
new file mode 100644
index 0000000..74eaa92
--- /dev/null
+++ b/counting_sheep.txt
@@ -0,0 +1,6 @@
+5
+0
+1
+2
+11
+1692