Optimal sort

#!/usr/bin/env python3

import sys


def main():
    # Input
    n = int(input())
    num = list(map(int,input().split()))[:n]

    #Main Part  
    length = len(num)

    pos = [*enumerate(num)]
    pos.sort(key = lambda it: it[1])

    vis = {k: False for k in range(length)}

    res = 0
    for i in range(length):
        if vis[i] or pos[i][0] == i:
            continue
        cycle = 0
        j = i

        while not vis[j]:
            vis[j] = True
            j = pos[j][0]
            cycle += 1
        
        if cycle > 0:
            res += (cycle - 1)
    #Output
    print(res)

if __name__ == "__main__":
    main()

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