diff --git a/1/a.cpp b/1/a.cpp
new file mode 100644
index 0000000..9551be3
--- /dev/null
+++ b/1/a.cpp
@@ -0,0 +1,21 @@
+#include <cstdint>
+#include <iostream>
+
+namespace {
+
+void solve() {
+  int64_t n, m, a;
+  std::cin >> n >> m >> a;
+
+  int64_t n_needed = n / a + (n % a > 0);
+  int64_t m_needed = m / a + (m % a > 0);
+
+  std::cout << (n_needed * m_needed) << "\n";
+}
+
+}  // namespace
+
+int main(void) {
+  solve();
+  return 0;
+}