View Compilation Error

0_0_31452150_20741.cpp: In function 'int main()':
0_0_31452150_20741.cpp:9:14: error: 'n' was not declared in this scope
           if(n==0)
              ^
0_0_31452150_20741.cpp:18:14: error: 'n' was not declared in this scope
      if(sum>=n)
              ^