diff --git a/20/1.py b/20/1.py
new file mode 100755
index 0000000..51cad98
--- /dev/null
+++ b/20/1.py
@@ -0,0 +1,14 @@
+for x in range(1, 1000):
+  a, b = 0, 1
+  xx = x
+  while xx > 0:
+    if xx % 2 > 0:
+      a += 1
+    else:
+      b += xx % 5
+    xx //= 5
+  if a == 2 and b == 9:
+    print(x)
+    break
+
+# 605
diff --git a/20/2.py b/20/2.py
new file mode 100755
index 0000000..8c2df02
--- /dev/null
+++ b/20/2.py
@@ -0,0 +1,14 @@
+for x in reversed(range(1, 1000)):
+  a, b = 0, 1
+  xx = x
+  while xx > 0:
+    if xx % 2 > 0:
+      a += 1
+    else:
+      b += xx % 5
+    xx //= 5
+  if a == 2 and b == 6:
+    print(x)
+    break
+
+# 960
diff --git a/20/3.py b/20/3.py
new file mode 100755
index 0000000..055e5a8
--- /dev/null
+++ b/20/3.py
@@ -0,0 +1,13 @@
+for x in range(1, 1000):
+  xx = x
+  x0 = x
+  n = 0
+  while xx > 0:
+    d = xx % 3
+    n = 10*n + d
+    xx //= 3
+  if n // 100000 > 0:
+    print(x)
+    break
+
+# 244
diff --git a/20/4.py b/20/4.py
new file mode 100755
index 0000000..b148048
--- /dev/null
+++ b/20/4.py
@@ -0,0 +1,13 @@
+k = 0
+for x in range(-1000, 1000):
+  xx = x
+  a, b = 0, 1
+  while xx > 0:
+    a += 1
+    b *= xx % 10
+    xx //= 10
+  if a == 2 and b == 0:
+    k += 1
+print(k)
+
+# 9
diff --git a/20/5.py b/20/5.py
new file mode 100755
index 0000000..09c3bf6
--- /dev/null
+++ b/20/5.py
@@ -0,0 +1,14 @@
+for x in range(100, 10000):
+  xx = x
+  l = xx - 16
+  m = xx + 16
+  while l != m:
+    if l > m:
+      l -= m
+    else:
+      m -= l
+  if m == 16:
+    print(x)
+    break
+
+# 128
diff --git a/20/6.py b/20/6.py
new file mode 100755
index 0000000..3a5d821
--- /dev/null
+++ b/20/6.py
@@ -0,0 +1,16 @@
+for x in reversed(range(1, 10000)):
+  xx = x
+  q = 6
+  l = 0
+  while xx >= q:
+    l += 1
+    xx -= q
+  m = xx
+  if m < l:
+    m = l
+    l = xx
+  if l == 3 and m == 5:
+    print(x)
+    break
+
+# 33
diff --git a/8/17.py b/8/17.py
new file mode 100644
index 0000000..4a4658d
--- /dev/null
+++ b/8/17.py
@@ -0,0 +1,7 @@
+n, s = 24, 0
+while n <= 28:
+  s += 20
+  n += 2
+print(s)
+
+# 60
diff --git a/8/24.py b/8/24.py
new file mode 100644
index 0000000..822050c
--- /dev/null
+++ b/8/24.py
@@ -0,0 +1,7 @@
+n, s = 0, 0
+while s <= 365:
+  s += 36
+  n += 10
+print(n)
+
+# 110
diff --git a/8/31.py b/8/31.py
new file mode 100644
index 0000000..fcebbc8
--- /dev/null
+++ b/8/31.py
@@ -0,0 +1,11 @@
+for d in range(1, 10000):
+  dd = d
+  n, s = 1, 46
+  while s <= 2700:
+    s += dd
+    n += 4
+  if n == 121:
+    print(d)
+    break
+
+# 89
diff --git a/8/39.py b/8/39.py
new file mode 100644
index 0000000..8a046e3
--- /dev/null
+++ b/8/39.py
@@ -0,0 +1,15 @@
+m, M = 10000000, -1
+for d in range(1, 10000000):
+  dd = d
+  n, s = 0, 24
+  while s <= 1318:
+    s += dd
+    n += 15
+  if n == 195:
+    if d < m:
+      m = d
+    if d > M:
+      M = d
+print(m, M)
+
+# 100 107
diff --git a/8/46.py b/8/46.py
new file mode 100644
index 0000000..0c83ab7
--- /dev/null
+++ b/8/46.py
@@ -0,0 +1,7 @@
+s, n = 0, 0
+while s * s <= 10 * s:
+  s += 1
+  n += 2
+print(n)
+
+# 22
diff --git a/8/53.py b/8/53.py
new file mode 100644
index 0000000..3fb2453
--- /dev/null
+++ b/8/53.py
@@ -0,0 +1,8 @@
+a, b, c = 0, 0, 0
+while 2*a < 200:
+  b += 3
+  c -= 1
+  a += b + c
+print(a - 10)
+
+# 100
diff --git a/8/60.py b/8/60.py
new file mode 100644
index 0000000..4b9ff2a
--- /dev/null
+++ b/8/60.py
@@ -0,0 +1,7 @@
+s, n = 6, 60
+while n > s:
+  s += 1
+  n -= 2
+print(n)
+
+# 24
diff --git a/8/p-02.py b/8/p-02.py
new file mode 100644
index 0000000..7453302
--- /dev/null
+++ b/8/p-02.py
@@ -0,0 +1,7 @@
+s, n = 33, 1
+while s > 0:
+  s -= 7
+  n *= 3
+print(n)
+
+# 243
diff --git a/8/p-03.py b/8/p-03.py
new file mode 100644
index 0000000..4a3fe99
--- /dev/null
+++ b/8/p-03.py
@@ -0,0 +1,11 @@
+for d in reversed(range(1, 1000000)):
+  dd = d
+  n, s = 0, 0
+  while s <= 365:
+    s += dd
+    n += 5
+  if n == 55:
+    print(d)
+    break
+
+# 36
diff --git a/1.cpp b/archive/1.cpp
similarity index 100%
rename from 1.cpp
rename to archive/1.cpp
diff --git a/1.py b/archive/1.py
similarity index 100%
rename from 1.py
rename to archive/1.py