题解 | #尼科彻斯定理#

import java.util.*;

public class Main{
    
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int m = sc.nextInt();
        int n = (m-1)*m+1;
        StringBuilder sb = new StringBuilder();
        sb.append(n);
        for(int i=1; i<m; i++){
            sb.append("+").append(n+2*i);
        }
        System.out.println(sb);
    }
}