View Compilation Error

0_0_37041699_1977.cpp: In function 'int main()':
0_0_37041699_1977.cpp:58:28: error: 'x' was not declared in this scope
 scanf("%d%d%d%d", &n, &m, &x, &y);
                            ^
0_0_37041699_1977.cpp:58:32: error: 'y' was not declared in this scope
 scanf("%d%d%d%d", &n, &m, &x, &y);
                                ^