/in/foo.cc: In function 'int main()':
/in/foo.cc:5:18: error: redeclaration of 'int n'
  int n,a,s=0,m=0,n=0;
                  ^
/in/foo.cc:5:6: note: 'int n' previously declared here
  int n,a,s=0,m=0,n=0;
      ^