codeforces 1A - Theater Square

从上周开始在cf上做水题了 慢慢把这些题的代码贴上来

#include<stdio.h>
int main()
{
    int m,n,a;
    scanf("%d%d%d",&m,&n,&a);
    printf("%-I64d\n",(long long)(m%a == 0 ? m/a : m/a +1)*((n%a == 0 ? n/a : n/a + 1)));
    return 0;
}