C ödevime yardım lazım

 
   
  #include <stdio.h> 
   
   
   
  int f(int i, int j) 
   
  { 
      if((i+j)%2==0) 
          return i + j - 1; 
      else 
          return i + j + 1; 
       
       
  } 
   
  int main(int argc, const char * argv[]) 
  { 
   
      int m, n; 
      int result = 0; 
      scanf("%d%d",&m,&n); 
       
       
      for (int i = 1; i <= n; i++) 
      { 
          for(int j = 1; j <= m; j++) 
               
          { 
              result = result + f(i,j); 
          } 
           
      } 
       
      printf("%d",result); 
      return 0; 
  }