Main.cc:2:7: error: expected nested-name-specifier before 'nameapce'
using nameapce std;
^
Main.cc: In function 'int main()':
Main.cc:4:5: error: 'cout' was not declared in this scope
cout<<1*2*3*4*5;
^
Main.cc:4:5: note: suggested alternative:
In file included from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:74:0,
from Main.cc:1:
/usr/include/c++/5/iostream:61:18: note: 'std::cout'
extern ostream cout; /// Linked to standard output
^