Cow health problems with a calf heifers, from birth each year, starting the fourth year students a small cow, here the law of the N cows a few years? Input: The questions have multiple sets of data. Each set of data is only an integer N, an exclusive line. (1 ≤ N ≤ 50) Output: for each set of data, output an integer (exclusive line) that the N cows when the number of years

main\Debug\main.exe
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....\main.cpp
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....\main.ncb
....\main.opt
....\main.plg
....\Debug
main

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