View Compilation Error

0_0_20881849_26635.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_20881849_26635.cpp: In function 'int main()':
0_0_20881849_26635.cpp:4:5: error: '__int64' was not declared in this scope
     __int64 i,a[55],n; 
     ^
0_0_20881849_26635.cpp:5:5: error: 'a' was not declared in this scope
     a[0]=0;
     ^
0_0_20881849_26635.cpp:8:9: error: 'i' was not declared in this scope
     for(i=3;i<=50;i++) 
         ^
0_0_20881849_26635.cpp:10:26: error: 'n' was not declared in this scope
     while(scanf("%I64d",&n)!=EOF) 
                          ^
0_0_20881849_26635.cpp:10:27: error: 'scanf' was not declared in this scope
     while(scanf("%I64d",&n)!=EOF) 
                           ^
0_0_20881849_26635.cpp:10:30: error: 'EOF' was not declared in this scope
     while(scanf("%I64d",&n)!=EOF) 
                              ^
0_0_20881849_26635.cpp:12:30: error: 'printf' was not declared in this scope
         printf("%I64d\n",a[n]); 
                              ^