#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("transport.in");
ofstream out("transport.out");
const int NMAX=16000;
int n,k,v[NMAX+5];
int ok(int c){
    int s,i,tr;
    tr=s=0;
    for(i=1;i<=n;i++){
        if(v[i]>c)
            return NMAX+1;
        if(s+v[i]<=c)
            s+=v[i];
        else{
            s=v[i];
            tr++;
        }
    }
    tr++;
    return tr;
}
int bsl (int st,int dr){
    int med,last=1;
    while(st<=dr){
        med=(st+dr)/2;
        if(ok(med)<=k){
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}
int main()
{
    int s,i;
    in>>n>>k;
    s=0;
    for(i=1;i<=n;i++){
        in>>v[i];
        s+=v[i];
    }
    out<<bsl(1,s);
    return 0;
}