View Compilation Error

0_0_32172144_26980.cpp: In function 'int main()':
0_0_32172144_26980.cpp:6:23: error: 'n' was not declared in this scope
  while(scanf("%d %d",&n,&m)==2)
                       ^
0_0_32172144_26980.cpp:6:26: error: 'm' was not declared in this scope
  while(scanf("%d %d",&n,&m)==2)
                          ^