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#include <bits/stdc++.h>
using namespace std;
int v[16001],drumuri,saltele;
bool check(long long volum)
{
long long cnt=1,s=0;
for(int i=1;i<=saltele;i++)
{
if(s+v[i]<=volum)
s+=v[i];
else
{
cnt++;
s=v[i];
}
}
return (cnt<=drumuri);
}
long long cb()
{
long long st=1,dr=16000*16000,mid,rasp;
while(st<=dr)
{
mid=(st+dr)/2;
if(check(mid))
{
rasp=mid;
dr=mid-1;
}
else st=mid+1;
}
return rasp;
}
int main()
{
ifstream fin("transport.in");
ofstream fout("transport.out");
fin>>saltele>>drumuri;
for(int i=1;i<=saltele;i++)
fin>>v[i];
fout<<cb();
return 0;
}