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import java.util.*;
public class DN03_63230317 {
public static void main (String[] args) {
Scanner sc = new Scanner(System.in);
long h = sc.nextInt();
long w = sc.nextInt();
long k = sc.nextInt();
if (w < h) { // a je to res potrebno
w += h;
h = w-h;
w -= h;
}
long sum = 0;
for (long i = 0; i < k; i++)
if ((w & (1 << i)) > 0) {
long add = h/(1 << i);
if (System.getenv("DN03_DEBUG") != null)
System.err.println("po širini: i == " + i + ". dodal bom " + add);
sum += add;
}
{
long add = (w/(1 << k))*(h/(1 << k));
if (System.getenv("DN03_DEBUG") != null)
System.err.println("dodal bom " + add + " največjih");
sum += add;
}
for (long i = 0; i < k; i++) {
if ((h & (1 << i)) > 0) {
long add = w/(1 << i);
if (System.getenv("DN03_DEBUG") != null)
System.err.println("po višini: i == " + i + ". dodal bom " + add);
sum += add;
if ((w & (1 << i)) > 0) {
if (System.getenv("DN03_DEBUG") != null)
System.err.println(w + " je skupen, odstranjujem eno");
sum--;
}
}
}
System.out.println(sum);
}
}
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