Codeforces Beta Round #1 A题

这题要注意数据 #include <cstdio>#include <iostream>using namespace std;int main(){    __int64 n, m, a;    scanf("%I64d%I64d%I64d", &n, &m, &a);    __int64 f1 = n/a;    __int64 f2 = m/a;    if(f1*a != n) f1++;    if(f2*a != m) f2++;    __int64 sum = f1*f2;    printf("%I64d\n", sum);}