foo.cpp:1:1: error: 'include' does not name a type
 include<iostream>
 ^
foo.cpp: In function 'int main()':
foo.cpp:5:2: error: 'cin' was not declared in this scope
  cin>>n>>m;
  ^
foo.cpp:14:2: error: 'cout' was not declared in this scope
  cout<<ans<<endl;
  ^
foo.cpp:14:13: error: 'endl' was not declared in this scope
  cout<<ans<<endl;
             ^