#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)
#define chmax(v,a) (v=v>=a?v:a)

typedef unsigned long ulong;

int b[100004];
int c[100004];

int main(){
	rd_init();
	int n=rd();
	int k=rd();
	rep(i,n){
		int a=rd();
		b[a]+=1;
	}
	int j=0;
	rep(i,100004){
		if(b[i]){
			chmax(j,b[i]);
			c[b[i]]+=1;
		}
	}
	int z=0;
	while(1){
		int x=c[j];
		if(k<=j*x){
			z+=(k-1)/j+1;
			wt1(z);
			_exit(0);
		}
		z+=x;
		k-=j*x;
		j-=1;
		while(!c[j]){
			j-=1;
		}
	}
}