/in/foo.cc: In function 'int main()':
/in/foo.cc:34:9: error: expected initializer before 'cin'
   34 |         cin>>n1;
      |         ^~~
/in/foo.cc:36:17: error: 'n1' was not declared in this scope
   36 |         Input(a,n1);
      |                 ^~