#include <fstream.h>
int i,n,k,kl,km, max;
struct nod{ int x; nod* y;};
nod a,c;
a=new nod; c=new nod; a.y=0;
void cit(){
	ifstream fin("transport.in");
	fin>>n>>kl;
	fin>>max; a.x=max;
	for(i=2;i<=n;i++){
		c.y=a;
		fin>>c.x;
		if(c.x>max)
			max=c.x;
		a=c;
	}
	fin.close();
}
int trans(){
	int i=1;
	km=0;
	k=max-1;	//max curent
	do {
		k++;
		c=a;
		km=0;  //nr drumuri
		q=0;  //cantitate curenta in camion
		while (c.y!=0){
			q=+c.x;
			if(km=k) c=c.y;
			if(km<k)
				c=c.y;
			else {
				q=0; km++;
			}
		}
	}while(k>kl);
	return k;
}
void write(int x){
	ofstream fout("transport.out");
	fout<<x;
	fout.close();
}
int main(){
	cit();
	write(trans());
	
	return 0;
}