View Compilation Error

0_0_28532090_7196.cpp:21:1: error: 'LL' does not name a type
 LL Mul(LL x,LL y,LL M){
 ^
0_0_28532090_7196.cpp: In function 'long long int China(int, long long int*, long long int*)':
0_0_28532090_7196.cpp:41:27: error: 'Mul' was not declared in this scope
         x=(x+Mul(Mul(y,w,M),a[i],M))%M;
                           ^
0_0_28532090_7196.cpp:41:35: error: 'Mul' was not declared in this scope
         x=(x+Mul(Mul(y,w,M),a[i],M))%M;
                                   ^
0_0_28532090_7196.cpp:41:35: error: redeclaration of '<typeprefixerror>Mul'
0_0_28532090_7196.cpp:41:27: note: previous declaration '<typeprefixerror>Mul'
         x=(x+Mul(Mul(y,w,M),a[i],M))%M;
                           ^