#include<stdio.h>
using namespace std;
int v[16001];
int main(){
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,maxi,lmax,lmin,i,nrt,c,l1,l2,lm,m;
    maxi=0;
    lmax=0;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    for(i=1;i<=n;i++){
        lmax=lmax+v[i];
        if(v[i]>maxi)
            maxi=v[i];
    }
    lmin=maxi;
    l1=lmin;
    l2=lmax;
    while(l1<=l2){
        c=0;
        nrt=1;
        m=(l1+l2)/2;
        for(i=1;i<=n;i++){
            if(c+v[i]<=m)
                c=c+v[i];
            else{
                nrt++;
                c=v[i];
            }
        }
        if(nrt<=k){
            l2=m-1;
            lm=m;
        }
        else
            l1=m+1;
    }
    printf("%d",lm);
    return 0;
}