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#include<stdio.h>
using namespace std;
int n,k,sol;
int v[16001];
bool ok(int c)
{
int i=0,t=0,vol;
while(1)
{
t++;
vol=c;
while(vol>=v[i])
{
vol-=v[i];
i++;
if(i==n) return 1;
}
if(t==k) return 0;
}
}
int main()
{
freopen("transport.in","r",stdin);
freopen("transport.out","w",stdout);
scanf("%d %d",&n,&k);
for(int i=0; i<n; i++) scanf("%d",&v[i]);
int pas=1<<16,start=0;
for(pas;pas>0;pas=pas>>1)
{
if(!ok(start+pas)) start+=pas;
if(ok(start+pas)) sol=start+pas;
if(ok(start)) sol=start;
}
printf("%d",sol);
}