#include <cstdio>

using namespace std;

int v[16005];
int n,k;

bool verif(int x)
{
    int j=0;
    for(int i=1;i<=k;++i)
    {
        int s=v[j];
        while(s<=x){
            s+=v[++j];
            if(j==n)
                return 1;
            }
    }
    return 0;
}

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int rez,pas;
    scanf("%d %d",&n,&k);
    for(int i=1;i<=n;++i)
    {
        scanf("%d",&v[i]);
    }
    pas=1<<28;
    rez=1<<28;
    while(pas>0)
    {
        if(verif(rez-pas))
            rez-=pas;
        pas/=2;
    }
    printf("%d",rez);
    return 0;
}