#include <bits/stdc++.h>
#define NMAX 16003

using namespace  std;

int n,k,hmax;
vector<int>v(NMAX);

int ok(int sol){
    if(sol<hmax)
        return false;
    else{
        int s=0,nr=1;
        for(int i=1;i<=n;i++){
            if(s+v[i]<=sol)
                s=s+v[i];
            else{
                s=v[i];
                nr++;
            }

        }

        return nr <= k;
    }
}

int main() {
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);

    scanf("%d %d",&n,&k);

    for(int i=1;i<=n;i++){
        scanf("%d",&v[i]);
        hmax=max(hmax,v[i]);
    }

    int st=1,dr=NMAX;

    while(st<=dr){
        int mid=(st+dr)/2;
        if(ok(mid)){
            dr=mid-1;
        }else{
            st=mid+1;
        }

    }
    printf("%d",st);

    return 0;
}