#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({ulong _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char wbuf[64],*wp=wbuf+sizeof wbuf;wt(v);write(1,wp,wbuf+sizeof wbuf-wp);})
#define rep(v,e) for(typeof(e) v=0;v<e;++v)

typedef unsigned long ulong;

void sort_aux(unsigned*a,unsigned*b,int n,int p){
	int c[512];
	for(int i=0;i<512;++i){
		c[i]=0;
	}
	for(int i=0;i<n;++i){
		++c[a[i]&511];
	}
	int t=0;
	for(int i=512;i--;){
		int u=c[i];
		c[i]=t;
		t+=u;
	}
	if(p==0){
		for(int i=0;i<n;++i){
			b[c[a[i]&511]++]=a[i]>>9|a[i]<<23;
		}
	}else{
		for(int i=0;i<n;++i){
			b[c[a[i]&511]++]=a[i]>>23|a[i]<<9;
		}
	}
}

void sort(unsigned*a,int n){
	static unsigned b[100004];
	sort_aux(a,b,n,0);
	sort_aux(b,a,n,1);
}

unsigned b[100004];

int main(){
	rd_init();
	int n=rd();
	int k=rd();
	rep(i,n){
		int a=rd();
		b[a]+=1;
	}
	sort(b,100004);
	int z=0;
	while(k>0){
		k-=b[z++];
	}
	wt1(z);
	_exit(0);
}