import sys
input = lambda : sys.stdin.readline().rstrip()

write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO)
LI = lambda : list(map(int, input().split()))
sys.setrecursionlimit(3*10**5+10)

class BIT:
    ### BIT binary
    def __init__(self, n, values=None):
        self.bit = [0]*(n+1)
        self.n = n
        self.total = 0
        if values is not None:
            for i,v in enumerate(values):
                self.add(i,v)
                self.total += v
    def check(self):
        l = []
        prv = 0
        for i in range(1,self.n+1):
            val = self.query(i)
            l.append(val-prv)
            prv = val
        print(" ".join(map(str, l)))
    #a1 ~ aiまでの和 O(logn)
    def query(self,i):
        res = 0
        while i > 0:
            res += self.bit[i]
            # res %= M
            i -= i&(-i)
        return res
    def get(self,i):
        return self.query(i+1) - self.query(i)
    #ai += x(logN)
    def add(self,i,x):
        i += 1
        if i==0:
            raise RuntimeError
        self.total += x
        while i <= self.n:
            self.bit[i] += x
            # self.bit[i] %= M
            i += i&(-i)
    def index(self, v):
        """a0,...,aiの和がv以上になる最小のindexを求める
        存在しないとき配列サイズを返す
        """
        if v <= 0:
            return 0
        if self.total<v:
            return self.n
        x = 0
        r = 1
        while r < self.n:
            r = r << 1;
        ll = r
        while ll>0:
            if x+ll<self.n and self.bit[x+ll]<v:
                v -= self.bit[x+ll]
                x += ll
            ll = ll>>1
        return x

m,k = LI()
a = list(map(int, input().split()))
n = len(a)
bit = [0]*k
count = [0]*m
index = [[] for _ in range(m)]
vals = [0]*n
vs = [0]*n
for i in range(n):
    v = a[i]
    vs[i] = v+m*count[v]
    index[v].append(i)
    val = bit[count[v]]
    bit[count[v]] += 1
    vals[i] = val
    count[v] += 1
bit2 = BIT(n)
total = 0
inv = 0
for v in vs:
    inv += total - bit2.query(v)
    bit2.add(v, 1)
    total += 1
ans = inv
for i in range(m):
    num = 0
    for ind in index[i]:
        num += vals[ind]
    inv += (-num) + ((m-1)*k-num)
    ans = min(ans, inv)
print(ans)