#include <cstdio>
#define MAX 16000
using namespace std;
int v[MAX+1];
int min(int a, int b)
{
    if(a<b)
        return a;
    return b;
}
int max(int a, int b)
{
    if(a>b)
        return a;
    return b;
}
int main()
{
    freopen("transport.in", "r", stdin);
    freopen("transport.out", "w", stdout);
    long long s=0, n, k, i, st, dr, mij, maxi=-1, cam, curent, minim;
    scanf("%lld%lld", &n, &k);
    for(i=1;i<=n;i++)
    {
        scanf("%d", &v[i]);
        s+=v[i];
        maxi=max(maxi, v[i]);
    }
    st=maxi;
    dr=s;
    minim=s;
    while(st<=dr)
    {
        cam=1;
        curent=0;
        mij=(st+dr)/2;
        for(i=1;i<=n;i++)
        {
            if(curent+v[i]<=mij)
                curent+=v[i];
            else{ cam++; curent=v[i];};
        }
        if(cam<=k)
        {
            minim=min(minim, mij);
            dr=mij-1;
        }
        else st=mij+1;
    }
    printf("%lld", minim);
    return 0;
}