diff --git a/10/10.py b/10/10.py
new file mode 100644
index 0000000..95273c8
--- /dev/null
+++ b/10/10.py
@@ -0,0 +1,23 @@
+
+with open("input") as f:
+    adapters = [int(x) for x in f.read().strip().split("\n")]
+
+adapters.extend([0, max(adapters)+3])
+adapters.sort()
+joltages = [b-a for a, b in zip(adapters, adapters[1:])]
+print(joltages.count(1)*joltages.count(3))
+
+
+joltages = ''.join(str(x) for x in joltages)
+joltages = joltages.split('3')
+
+counts = {
+        '': 1,
+        '1': 1,
+        '11': 2,
+        '111': 4,
+        '1111': 7,
+        }
+from functools import reduce
+print(reduce(lambda x, y: x*counts[y], joltages, 1))
+
diff --git a/10/input b/10/input
new file mode 100644
index 0000000..5b0d755
--- /dev/null
+++ b/10/input
@@ -0,0 +1,102 @@
+153
+17
+45
+57
+16
+147
+39
+121
+75
+70
+85
+134
+128
+115
+51
+139
+44
+65
+119
+168
+122
+72
+105
+31
+103
+89
+154
+114
+55
+25
+48
+38
+132
+157
+84
+71
+113
+143
+83
+64
+109
+129
+120
+100
+151
+79
+125
+22
+161
+167
+19
+26
+118
+142
+4
+158
+11
+35
+56
+18
+40
+7
+150
+99
+54
+152
+60
+27
+164
+78
+47
+82
+63
+46
+91
+32
+135
+3
+108
+10
+159
+127
+69
+110
+126
+133
+28
+15
+104
+138
+160
+98
+90
+144
+1
+2
+92
+41
+86
+66
+95
+12