BOJ 13136 - Do Not Touch Anything [C++]

문제

링크

풀이

#include <iostream>
using namespace std;
 
void solve(void) {
  long long r, c, n; cin >> r >> c >> n;
 
  cout << ((r+n-1)/n) * ((c+n-1)/n);
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}