feat(go): 1a

go/1A.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	in := bufio.NewReader(os.Stdin)
+	var n, m, a int64
+	fmt.Fscan(in, &n, &m, &a)
+
+	tilesN := (n + a - 1) / a
+	tilesM := (m + a - 1) / a
+
+	fmt.Println(tilesN * tilesM)
+}