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#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
long long n,v[16016],k,s,st,dr,mij,rez;
bool verif(long long a)
{
long long suma=0,nr=1;
for(int i=1; i<=n; i++)
{
if(suma+v[i]<=a)
suma+=v[i];
else
{
nr++;
suma=v[i];
if(nr>k)
return 0;
}
}
return 1;
}
int main()
{
fin>>n>>k;
for(int i=1; i<=n; i++)
{
fin>>v[i];
s+=v[i];
}
st=1;
dr=s;
rez=s;
while(st<=dr)
{
mij=(st+dr)/2;
if(verif(mij))
{
rez=min(mij,rez);
dr=mij-1;
}
else
st=mij+1;
}
fout<<rez;
return 0;
}