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#include <fstream>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
const int INF=16001;
int trans(int v[],int n,int V)
{
int vc=0,nr=0;
for(int i=0;i<n;i++)
{
if(v[i]>V)
{
return INF;
}
if(v[i]>vc)
{
nr++;
vc=V;
}
vc-=v[i];
}
return nr;
}
int cb(int v[],int k,int n)
{
int V=0,pas=1<<28;
while(pas!=0)
{
if(trans(v,n,V+pas)>k)
{
V+=pas;
}
pas/=2;
}
V++;
return V;
}
int main()
{
int n,k,i,v[16000];
cin>>n>>k;
for(i=0;i<n;i++)
{
cin>>v[i];
}
cout<<cb(v,k,n);
return 0;
}