foo.cc: In function 'int main()':
foo.cc:14:5: error: expected primary-expression before '{' token
   14 |     {
      |     ^
foo.cc:13:32: error: expected ')' before '{' token
   13 |     for(int i=1;i<=sqrt(m*n);i+
      |        ~                       ^
      |                                )
   14 |     {
      |     ~                           

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