#include <cstdio>
int v[16000];
int n,k;
using namespace std;
int ok(int C)
{
    int tr=0,s=0,i;
    for(i=1; i<=n; i++){
        if(v[i]>C)
            return 0;
        s=s+v[i];
        if(s>C){
            tr++;
            s=v[i];
        }
    }
    if(s>0)
        tr++;
    return tr<=k;
}
int bs(int dr)
{
    int st,last,med;
    last=dr+1;
    st=1;
    while(st<=dr){
        med=(st+dr)/2;
        if(ok(med)){
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}
int main()
{   freopen("transport.in", "r",stdin);
    freopen("transport.out", "w",stdout);
    int s=0,i;
    scanf("%d%d", &n, &k);
    for(i=1; i<=n; i++){
        scanf("%d", &v[i]);
        s=s+v[i];
    }
    printf("%d", bs(s));
    return 0;
}