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#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int a[16005];
int n,k;
int SePoate(int M)
{
int s=0,i,nrs=1;
for(i=1;i<=n;i++)
{
if(a[i]>M) return 0;
if(s+a[i]<=M) s+=a[i];
else
{
s=a[i];
nrs++;
if(nrs>k) return 0;
}
}
return 1;
}
int CB()
{
int st,dr,mij,sol;
st=1;
dr=256000000;
sol=0;
while(st<=dr)
{
mij=(st+dr)/2;
if(SePoate(mij)==1)
{
sol=mij;
dr=mij-1;
}
else st=mij+1;
}
return sol;
}
int main()
{
int i;
fin>>n>>k;
for(i=1;i<=n;i++)
fin>>a[i];
fout<<CB();
return 0;
}