View Compilation Error

0_0_18223138_31107.cpp: In function 'int main()':
0_0_18223138_31107.cpp:10:11: error: 'f' was not declared in this scope
 f(ans <= m)  
           ^
0_0_18223138_31107.cpp:12:9: error: 'else' without a previous 'if'
         else  
         ^