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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
int v[16001],n,k,mx,s,poz;
int transport(int x,int m)
{
int p=0,sum=0;
for (int i=1; i<=m; i++)
{
sum=sum+v[i];
if(sum+v[i+1]>x)
{
p++;
sum=0;
}
}
if (sum>0)
{
p++;
}
return p;
}
int main()
{
fin>>n>>k;
for (int i=1; i<=n; i++)
{
fin>>v[i];
if (v[i]>mx)
mx=v[i];
s=s+v[i];
}
int st=mx,dr=s,mij,ok=0;
while (st<=dr)
{
mij=(st+dr)/2;
int g=transport(mij,n);
if (g<=k)
{
poz=mij;
dr=mij-1;
}
else st=mij+1;
}
fout<<poz;
return 0;
}