#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
    int m;
    scanf("%d", &m);
    for (int i = m * m - m + 1; i < m * m + m - 1;) {
        printf("%d+", i);
        i += 2;
    }
    printf("%d", m * m + m - 1);
    return 0;
}

纯粹的数学找规律问题,题目看似难懂,找规律就很简单