View Compilation Error

0_0_21522921_17577.cpp: In function 'int main()':
0_0_21522921_17577.cpp:4:18: error: expected initializer before 'n'
  long long int64 n,sum;
                  ^
0_0_21522921_17577.cpp:5:22: error: 'n' was not declared in this scope
  while(scanf("%lld",&n)!=EOF)
                      ^
0_0_21522921_17577.cpp:11:4: error: 'sum' was not declared in this scope
    sum=0;
    ^