View Compilation Error

0_0_28240326_16964.cpp: In function 'int main()':
0_0_28240326_16964.cpp:20:42: error: 'x' was not declared in this scope
         for(int i=1;i<=n;i++)scanf("%d",&x),sum+=z;
                                          ^
0_0_28240326_16964.cpp:22:27: error: 'x' was not declared in this scope
             scanf("%lld",&x);
                           ^