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