View Compilation Error

0_0_16755289_15864.cpp: In function 'int main()':
0_0_16755289_15864.cpp:85:41: error: invalid initialization of reference of type 'int&' from expression of type 'LL {aka long long int}'
             add(ans, (LL)f[n][i] * i % Z);
                                         ^
0_0_16755289_15864.cpp:50:6: note: in passing argument 1 of 'void add(int&, int)'
 void add(int &x, int y)
      ^