View Compilation Error

0_0_14793225_13294.cpp:17:1: error: 'LL' does not name a type
 LL ppow(LL a,LL b)
 ^
0_0_14793225_13294.cpp: In function 'int main()':
0_0_14793225_13294.cpp:31:5: error: 'LL' was not declared in this scope
     LL n;
     ^
0_0_14793225_13294.cpp:35:24: error: 'n' was not declared in this scope
         scanf("%I64d",&n);
                        ^
0_0_14793225_13294.cpp:36:36: error: 'ppow' was not declared in this scope
         printf("%I64d\n",ppow(2,n-1)-1);
                                    ^