#include <bits/stdc++.h>
using namespace std;
int main()
{
long long n,dem=0,s=0;
cin >> n;
for (long long i=1;i<=n;i+=2){
dem++;
s+=i;
}
cout << "tu 0 den n co: " << dem << " so le" << endl;
cout << "tong cac so le do la: " << s;
return 0;
}
var i,n,d:integer;
s:longint;
begin
write('n = ');readln(n);
for i:=1 to n do
if i mod 2 <> 0 then
begin
d:=d+1;
s:=s+i;
end;
writeln('co ',d,' so le');
write('tong cac so le la ',s);
readln;
end.