相邻整数

package geekfly.test;

import java.util.Scanner;

public class 相邻整数 {

    public static void main(String[] args) {
        int total = 0,all=0,arr1[]=new int[1000];
        Scanner sc = new Scanner(System.in);
        all = sc.nextInt();
        for(int i=0;i<all;i++){
            arr1[i] = sc.nextInt();
        }
        for(int i=0;i<all;i++){
            int num = arr1[i];
            for(int j=0;j<all;j++){
                if(arr1[i]==arr1[j]+1){
                    total++;
                    break;
                }
            }
        }
        System.out.println(total);

    }

}