View Compilation Error

0_0_37788301_958.cpp: In function 'int main()':
0_0_37788301_958.cpp:50:23: error: expected ')' before ';' token
  while(cin>>n>>m>>x>>y;)
                       ^
0_0_37788301_958.cpp:50:24: error: expected primary-expression before ')' token
  while(cin>>n>>m>>x>>y;)
                        ^