#include<cstdio>
int v[16005],n,k;
int incerc(int nr)
{
    int s=0,nrt=0,i;
    for(i=1;i<=n;i++)
    {
        if(v[i]>nr)
            return k+1;
        if(s+v[i]<=nr)
            s=s+v[i];
        else
        {
            s=v[i];
            nrt++;
        }
    }
    if(s>0)
        nrt++;
    return nrt;
}
int lbs(int st,int dr)
{
    int med,last=0;
    while(st<=dr)
    {
        med=(st+dr)>>1;
        if(incerc(med)<=k)
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    int i;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    printf("%d\n",lbs(1,100));
    return 0;
}