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