View Compilation Error

0_0_14917679_24156.cpp: In function 'int main()':
0_0_14917679_24156.cpp:40:16: error: 'n' was not declared in this scope
  while( cin >> n >> m >> k)
                ^
0_0_14917679_24156.cpp:40:21: error: 'm' was not declared in this scope
  while( cin >> n >> m >> k)
                     ^