View Compilation Error

0_0_21456815_11784.cpp: In function 'int main()':
0_0_21456815_11784.cpp:9:11: error: 'i' was not declared in this scope
         F(i,1,n) { scanf("%d",&x);cnt+=(x<=35); }
           ^
0_0_21456815_11784.cpp:9:16: error: 'F' was not declared in this scope
         F(i,1,n) { scanf("%d",&x);cnt+=(x<=35); }
                ^