#include<stdio.h>
#define DIM 16005
int n,k,a[DIM];
int check (int x)
{
    int sum=0,q=0,i;
    for(i=1;i<=n;++i)
    {
        if(sum+a[i]>x)
            sum=a[i],++q;
        else
            sum+=a[i];
        if(q>k)
            return 0;
    }
    return 1;
}
int solve (int st,int dr)
{
    int mij,min=dr;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(check(mij))
            min=mij,dr=mij-1;
        else
            st=mij+1;
    }
    return min+1;
}
int main ()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int i,sum=0,max=0;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;++i)
    {
        scanf("%d",&a[i]);
        sum+=a[i];
        if(max<a[i])
            max=a[i];
    }
    printf("%d",solve (max,sum));
    return 0;
}