View Compilation Error

0_0_13280262_16840.cpp: In function 'int main()':
0_0_13280262_16840.cpp:6:9: error: '_int64' was not declared in this scope
         _int64 n,route[50]={0,1,2};
         ^
0_0_13280262_16840.cpp:9:17: error: 'route' was not declared in this scope
                 route[i]=route[i-1]+route[i-2];
                 ^
0_0_13280262_16840.cpp:11:20: error: 'n' was not declared in this scope
         while(cin>>n)
                    ^
0_0_13280262_16840.cpp:17:31: error: 'route' was not declared in this scope
                         cout<<route[b-a]<<endl;
                               ^