View Compilation Error

0_0_30597083_21822.cpp: In function 'int main()':
0_0_30597083_21822.cpp:48:28: error: 'cas' was not declared in this scope
    printf("Case #%d: No\n",cas++);
                            ^
0_0_30597083_21822.cpp:60:45: error: 'cas' was not declared in this scope
   if(bm(2*n)==2*n) printf("Case #%d: Yes\n",cas++);
                                             ^
0_0_30597083_21822.cpp:61:32: error: 'cas' was not declared in this scope
   else printf("Case #%d: No\n",cas++);
                                ^