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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-2.py < input-file
+#
+
+import fileinput
+from math import sqrt
+
+SQRT5 = sqrt (5)
+PHI = (1 + SQRT5) / 2
+
+for line in fileinput . input ():
+ print (round (pow (PHI, int (line) + 1) / SQRT5))