#include<fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16005];
int i,r,p,u,mid;
int vf(int x){
    int s=0;
    int K=0;
    for(int i=1;i<=n;i++){
        s+=v[i];
        if(s>x){
            K++;
            s=v[i];
        }
    }
    if(s!=0){
        K++;
    }
    if(K<=k){
        return 1;
    }
    return 0;
}
int main(){
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
    }
    p=1;
    u=16001*16001;
    while(p<=u){
        mid=(p+u)/2;
        r=vf(mid);
        if(r==0){
            p=mid+1;
        }else{
            u=mid-1;
        }
    }
    fout<<p<<"\n";
    return 0;
}