python/C++课程/第七课顺序结构程序设计/p56_1.cpp

#include <stdio.h>

int main(void) {
	long n, m, a;
	scanf("%ld%ld%ld", &n, &m, &a);
	printf("%ld\n", (n / a) * (m / a));
	return 0;
}