package main

import (
	"fmt"
	"math/rand"
)

func main() {
	var n int
	fmt.Scan(&n)
	a := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Scan(&a[i])
	}
	m := 10
	fmt.Println("10")
	for i:=0; i<m; i++{
		fmt.Println(rand.Int()%(n)+1, rand.Int()%(n)+1)
	}
}


func isKadomatsu(a, b, c int)bool{
	return true
}