#include <stdio.h>

int n,k,i,v[16010];
long min,max,s=0,nr,suma;

int main()
{
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	scanf("%d%d",&n,&k);
	for(i=1;i<=n;i++){
		scanf("%d",&v[i]);
		if(v[i]>s){
			s=v[i];
		}
		max+=v[i];
	}
	min=s;
	suma =max;
	while(min<max){
		nr=(min+max)/2;
		if(suma/nr<k){
			max=nr-1;
		}else{
			min=nr+1;
		}
	}
	printf("%d",nr+1);
	return 0;
}