Sample output:

$ ./hanoi 5
1 2
1 3
2 3
1 2
3 1
3 2
1 2
1 3
2 3
2 1
3 1
2 3
1 2
1 3
2 3
1 2
3 1
3 2
1 2
3 1
2 3
2 1
3 1
3 2
1 2
1 3
2 3
1 2
3 1
3 2
1 2