foo.cc: In function 'int main()':
foo.cc:14:15: error: expected ';' before '<=' token
   14 |  for(int i=2,i<=n;i++)
      |               ^~
      |               ;
foo.cc:14:15: error: expected primary-expression before '<=' token
   14 |  for(int i=2,i<=n;i++)
      |               ^~

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