View Compilation Error

0_0_22013583_30589.cpp: In function 'int main()':
0_0_22013583_30589.cpp:13:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_22013583_30589.cpp:30:26: error: 'printf' was not declared in this scope
         printf("%d\n",Y-1);
                          ^