foo.cc:1:2: error: invalid preprocessing directive #iclude; did you mean #include?
 #iclude <iostream>
  ^~~~~~
  include
foo.cc: In function 'int main()':
foo.cc:6:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^~~
foo.cc:6:5: note: suggested alternative: 'main'
     cin>>n;
     ^~~
     main
foo.cc:7:5: error: 'cout' was not declared in this scope
     cout<<(n-1)*3;
     ^~~~

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