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#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16001];
int calc(int nr)
{
int l= nr;
int t=1;
for(int i=1;i<=n;i++)
{
if(l>=v[i])
{
l-=v[i];
}
else
{
t++;
l=nr-v[i];
}
}
return t;
/*int t = 1;
int l = nr;
int elem=1;
while(elem<=n)
{
if(l>=v[elem])
{
l-=v[elem];
elem++;
}
else
{
l=l-v[elem]+nr;
elem++;
t++;
}
}
return t;
*/
}
int b_search(int tmax)
{
int st=1;
int dr=256000000;
int poz = 1;
while(st<=dr)
{
int mid=(st+dr)/2;
if(calc(mid)>tmax)
{
st=mid+1;
}
else
{
dr=mid-1;
poz=mid;
}
}
return poz;
}
int main()
{
fin>>n>>k;
for(int i=1;i<=n;i++)
{
fin>>v[i];
}
fout<<b_search(k);
}