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