I write on DVc++ program, and then has been shown collect2 exe [Error] ld returned 1 exit status

#include
using namespace std;
Int wa (int a, int b)
{
If (a==b | | b==0)
return 1;
The else
Return wa (b - a - 1, 1) + wa (a - 1, b);
}
Int main ()
{
Int k, n;
Cin> K> n;
Coutreturn 0;
}