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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
int n,k,a[16002],mx,nr;
int main()
{
fin>>n>>k;
for(int i=1;i<=n;i++)
{
fin>>a[i];
mx=max(mx,a[i]);
}
int st=mx,dr=256000000;
while(st<=dr)
{
int mij=(st+dr)/2;
int drumuri=1,c=0;
for(int i=1;i<=n;i++)
{
if(a[i]+c<=mij)
c=c+a[i];
else
{
drumuri++;
c=a[i];
}
}
if(drumuri>k)
{
st=mij+1;
}
else
{
nr=mij;
dr=mij-1;
}
}
fout<<nr;
return 0;
}