Calculate the run-time efficiency of the following program segment:
1 i = 1
2 loop (i <= n)
1 j = 1
2 loop (j <= n)
1 k = 1
2 loop (k <= n)
1 print (i, j, k)
2 k = k + 1
3 end loop
4 j = j + 1
3 end loop
4 i = i + 1
3 end loop