foo.cc: In function 'int main()':
foo.cc:11:15: error: expected ';' before '}' token
   11 |   s+=factorial
      |               ^
      |               ;
   12 |  }
      |  ~             
foo.cc:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~

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