//horatiu11
# include <cstdio>
# include <iostream>
# define nmax 16001
using namespace std;
int a[nmax],n,k;
int st,dr=nmax*nmax;
int main()
{
    int i,sum,val,mij;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;++i)
    {
        scanf("%d",&a[i]);
        st=max(st,a[i]);
    }
    while(st<=dr)
    {
        sum=0;val=1;
        mij=(st+dr)>>1;
        for(i=1;i<=n;++i)
            if(sum+a[i]<=mij)sum+=a[i];
            else sum=a[i],++val;
        if (val>k)st=mij+1;
        else dr=mij-1;
    }
    printf("%d\n",st);
    return 0;
}