foo.cc: In function 'int main()':
foo.cc:16:19: error: expected ')' before '{' token
   16 |   for(i=2;i<=n;i++
      |      ~            ^
      |                   )
   17 |  {
      |  ~                 
foo.cc:12:11: warning: unused variable 'k' [-Wunused-variable]
   12 |  long i,j,k,l;
      |           ^
foo.cc:12:13: warning: unused variable 'l' [-Wunused-variable]
   12 |  long i,j,k,l;
      |             ^

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