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#include <iostream>
using namespace std;

int main() {
    long long int n;
    long long int m;
    long long int a;
    
    cin >> n;
    cin >> m;
    cin >> a;
    
    long long int titles1 = n/a;
    long long int titles2 = m/a;
    
    if (n%a != 0) titles1++;
    if (m%a != 0) titles2++;
    
    long long int result = titles1*titles2;
    cout << result;
    
    return 0;
}