#include<cstdio>
using namespace std;
int v[16001],n,k;
bool ok(int C){
	int tr,s,i;
	tr=s=0;
for(i=1;i<=n;i++){
if(v[i]>C)
return 0;
s=s+v[i];
if(s>C)
tr++,s=v[i];
}
if(s>0)
tr++;
return tr<=k;
}
int bs(int st,int dr)
{
    int med,last=dr+1;
    while(st<=dr)
    {
        med=dr-((dr-st)>>1);
        if(ok(med))
            last=med,dr=med-1;
        else
            st=1+med;
    }
    return last;
}
int main(){
	freopen("transport.in","r",stdin);
	freopen("transport.out","w",stdout);
	scanf("%d%d",&n,&k);
	int i,smax=0;
	for(i=1;i<=n;i++){
		scanf("%d",&v[i]);
	smax=smax+v[i];
	}
	printf("%d\n",bs(1,smax));
}