View Compilation Error

0_0_35360367_20991.cpp:1:2: error: invalid preprocessing directive #includ
 #includ <iostream>
  ^
0_0_35360367_20991.cpp: In function 'int main()':
0_0_35360367_20991.cpp:6:8: error: 'cin' was not declared in this scope
  while(cin>>n)
        ^
0_0_35360367_20991.cpp:8:3: error: 'cout' was not declared in this scope
   cout<<n*(n-1)/2<<endl;
   ^
0_0_35360367_20991.cpp:8:20: error: 'endl' was not declared in this scope
   cout<<n*(n-1)/2<<endl;
                    ^