View Compilation Error

0_0_19482134_6436.cpp: In function 'int main()':
0_0_19482134_6436.cpp:8:2: error: '_int64' was not declared in this scope
  _int64 s,p;
  ^
0_0_19482134_6436.cpp:11:3: error: 'p' was not declared in this scope
   p=pow(3,n);
   ^
0_0_19482134_6436.cpp:14:3: error: 's' was not declared in this scope
   s=p-q;
   ^