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Main.cc: In function ‘int main()’:
Main.cc:20:16: error: expected primary-expression before ‘||’ token
     while(n <= || n >= 5000) {scanf("%d",&n);}
                ^~
Main.cc: In function ‘void input(int&)’:
Main.cc:14:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:19:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int n; scanf("%d",&n);
         ~~~~~^~~~~~~~~
Main.cc:20:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     while(n <= || n >= 5000) {scanf("%d",&n);}
                               ~~~~~^~~~~~~~~