#include<fstream>
using namespace std;
int v[16001];
int main(){
ifstream cin("transport.in");
ofstream cout("transport.out");
int n,i,k,st,dr,mij,rez,s,nrt;
cin>>n>>k;
st=-1;
dr=0;
for(i=1;i<=n;i++)
{
    cin>>v[i];
    if(st<v[i])
        st=v[i];
    dr=dr+v[i];
}
while(st<=dr)
{
    mij=(st+dr)/2;
    s=0;
    nrt=1;
    for(i=1;i<=n;i++)
    {
        if(s+v[i]<=mij)
            s=s+v[i];
        else
        {
            s=v[i];
            nrt++;
        }
    }

    if(nrt>k)
        st=mij+1;
    else{
        rez=mij;
        dr=mij-1;
    }
}
cout<<rez;
return 0;
}