0_0_27200021_31160.cpp:1:1: error: 'n' does not name a type
n n
^
0_0_27200021_31160.cpp: In function 'int main()':
0_0_27200021_31160.cpp:21:16: error: expected primary-expression at end of input
scanf ("%d",
^
0_0_27200021_31160.cpp:21:16: error: expected '}' at end of input
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