using System;
class Program
{
public static void print1_to_N(int number, int N) {
if (number <= N) {
Console.Write(number + " ");
print1_to_N(number + 1, N);
}
}
static void Main() {
int number = 1;
print1_to_N(number, 31);
}
}
/*
run:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
*/