View Compilation Error

0_0_29105779_30919.cpp: In function 'int main()':
0_0_29105779_30919.cpp:10:9: error: 'n' was not declared in this scope
   if((--n)%(m+1)) cout << "first" << endl;
         ^
0_0_29105779_30919.cpp:10:13: error: 'm' was not declared in this scope
   if((--n)%(m+1)) cout << "first" << endl;
             ^