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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
long long a[16001];
int main()
{
long long n,k,max=-1,s=0;
fin>>n>>k;
for (int i=1;i<=n;i++)
{
fin>>a[i];
s+=a[i];
if (a[i]>max) max=a[i];
}
long long st=max,dr=s,cnt,mij,c,ans;
while (st<=dr)
{
cnt=1;
mij=(st+dr)/2;
c=mij;
for (int i=1;i<=n;i++)
{
if (c>=a[i])
{
c-=a[i];
}
else
{
cnt++;
c=mij-a[i];
}
}
if (cnt>k) st=mij+1;
else dr=mij-1;
}
fout<<st;
return 0;
}