foo.cc: In function 'int main()':
foo.cc:15:39: error: expected ';' before ')' token
   15 |    cout<<7*r + cceil( n-kun(r) , r+1 ) )
      |                                       ^~
      |                                       ;
foo.cc:7:10: warning: unused variable 'ans' [-Wunused-variable]
    7 |     ll n,ans=0;
      |          ^~~

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