During Frosh Week, students play various fun games to get to know each other and compete against other teams. In one such game, all the frosh on a team stand in a line, and are then asked to ar- range themselves according to some criterion, such as their height, their birth date, or their student num- ber. This rearrangement of the line must be accom- plished only by successively swapping pairs of consec- utive students. The team that finishes fastest wins. Thus, in order to win, you would like to minimize the number of swaps required. Input Input contains several test cases. For each test case, the first line of input contains one positive integer n, the number of students on the team, which will be no more than one million. The following n lines each contain one integer, the student number of each student on the team. No student number will appear more than once. Output For each test case, output a line containing the minimum number of swaps required to arrange the students in increasing order by student number. Sample Input 3 3 1 2 Sample Output 2