View Compilation Error

0_0_37739459_22493.cpp: In function 'int main()':
0_0_37739459_22493.cpp:12:13: error: 'n' was not declared in this scope
  while(cin>>n>>k)
             ^
0_0_37739459_22493.cpp:12:16: error: 'k' was not declared in this scope
  while(cin>>n>>k)
                ^