#include <iostream>
using namespace std;
int ile_kolor(int k, char kolor) {
if (kolor== 'c')
return k*k/2;
else
return (k*k-1)/2+1;
}
int main() {
cout<<ile_kolor(8, 'c')<<endl;
cout<<ile_kolor(8, 'n')<<endl;
cout<<ile_kolor(9, 'c')<<endl;
cout<<ile_kolor(9, 'n')<<endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgaWxlX2tvbG9yKGludCBrLCBjaGFyIGtvbG9yKSB7CglpZiAoa29sb3I9PSAnYycpCglyZXR1cm4gayprLzI7CgllbHNlCglyZXR1cm4gKGsqay0xKS8yKzE7Cn0KaW50IG1haW4oKSB7CmNvdXQ8PGlsZV9rb2xvcig4LCAnYycpPDxlbmRsOwpjb3V0PDxpbGVfa29sb3IoOCwgJ24nKTw8ZW5kbDsKY291dDw8aWxlX2tvbG9yKDksICdjJyk8PGVuZGw7CmNvdXQ8PGlsZV9rb2xvcig5LCAnbicpPDxlbmRsOwoJcmV0dXJuIDA7Cn0=