#include<stdio.h>
using namespace std;
int n,k,sol;
int v[16001];
bool ok(int c)
{
    int i=0,t=0,vol;
    while(1)
    {
        vol=c;
        while(vol>=v[i])
        {
            vol-=v[i];
            i++;
            if(i==n&&t!=k-1) return 1;
        }
        t++;
        if(t==k) return 0;
    }
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d %d",&n,&k);
    for(int i=0; i<n; i++) scanf("%d",&v[i]);
    int pas=1<<14,start=0;
    for(pas;pas>0;pas=pas>>1)
    {
        if(!ok(start+pas)) start+=pas;
        else sol=start+pas;
    }
    printf("%d",sol);
}