View Compilation Error

0_0_34195618_17821.cpp: In function 'int main()':
0_0_34195618_17821.cpp:10:3: error: 'inat' was not declared in this scope
   inat ans = 1;
   ^
0_0_34195618_17821.cpp:13:4: error: 'ans' was not declared in this scope
    ans = 2*ans+2;
    ^
0_0_34195618_17821.cpp:15:11: error: 'ans' was not declared in this scope
   cout << ans << endl;
           ^