View Compilation Error

0_0_30724748_3806.cpp: In function 'int main()':
0_0_30724748_3806.cpp:7:13: error: redeclaration of 'int n'
         int n;
             ^
0_0_30724748_3806.cpp:5:14: note: 'int n' previously declared here
     for (int n; cin >> n; )
              ^