int main()
{
    int a;
    printf("Enter the max number upto which you have to list all prime number: ");
    scanf("%d", &a);

    for (int i = 1; i <= a; i++)
    {
        for (int j = 2; j <= (i - 1); j++)
        {
            if ((i % 2) != 0)
            {
                printf("%d \n", i);
                break;
            }
        }
    }
}