from collections import Counter
import sys
def main():
input = sys.stdin.read().split()
N = int(input[0])
K = int(input[1])
A = list(map(int, input[2:2+N]))
counts = Counter(A)
freq = sorted(counts.values(), reverse=True)
if len(freq) <= K:
print(0)
else:
print(sum(freq[K:]))
if __name__ == "__main__":
main()
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