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#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16002];
int cv[16002];
long long s=0,rasp=0;
int main()
{
int n,k,maxim=0;
fin>>n>>k;
for(int i=1;i<=n;i++)
{
fin>>v[i];
if(v[i]>maxim) maxim=v[i];
s=s+v[i];
}
int j=1, st=maxim,dr=s;
while(st<dr)
{
int mij=(st+dr)/2;
int kcur=1;
bool ok=true;
s=0;
for(int i=1;i<=n;i++)
{
if(s+v[i]<=mij)
{
s=s+v[i];
}
else
{
s=v[i];
kcur++;
if(kcur>k) ok=false;
}
}
if(ok==true)
{
dr=mij;
}
else
{
st=mij+1;
}
}
fout<<dr;
return 0;
}