#include <stdio.h>

int main()
{
    int m = 0;
    scanf("%d",&m);
    int arr[m];
    arr[0] = m * (m - 1) + 1;
    for(int i = 1;i < m;i++)
    {
        arr[i] = arr[i - 1] + 2;
    }
    for(int i = 0;i < m;i++)
    {
        printf("%d",arr[i]);
        if(arr[i] != arr[m - 1])
        {
            printf("+");
        }
    }
    return 0;
}