#include <cstdio>

using namespace std;

int v[16010];

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int n,k,s=0,maxx=0,st,dr,mid,p;
    scanf("%d%d",&n,&k);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        if(v[i]>maxx) maxx=v[i];
        s+=v[i];
    }
    st=maxx;dr=s;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        p=0;s=mid;
        for(int i=1;i<=n;i++)
            if(v[i]<=s) s-=v[i];
            else {s=mid-v[i];p++;}
        p++;
        if(p<=k) dr=mid-1;
        else st=mid+1;
    }
    printf("%d",st);
    return 0;
}