#include <bits/stdc++.h>
using namespace std;
int main(){
	long long n,m,a;
	//scanf("%lld%lld%lld",&n,&m,&a);
	//printf("%lld",(long long)(floor(n*1.0/a*m/a)));
  	cin>>n>>m>>a;
  	a*=a;
   	n*=m;
    	cout<<(long long)floor(n*1.0/a);
	return 0;
}

https://qqwhale.com/problem/1156