For problem statement at 0-999/0-99/40-49/41/problemE.txt this is a correct solution, but verifier at 0-999/0-99/40-49/41/verifierE.go ends with All tests passed can you fix the verifier? ```go
package main

import "fmt"

func main() {
	var n int
	fmt.Scan(&n)

	k := n / 2
	m := k * (n - k)
	fmt.Println(m)

	for i := 1; i <= k; i++ {
		for j := k + 1; j <= n; j++ {
			fmt.Println(i, j)
		}
	}
}
```