#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=x;
    int K=k-1;
    for(int i=1;i<=n && K>=0;i++){
        if(s-v[i]<0){
            s=x;
            K--;
        }
        s-=v[i];
    }
    if(s-v[i]<0){
        s=x;
        K--;
    }
    if(K>=0){
        return 1;
    }
    return 0;
}
int main(){
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
    }
    p=1;
    u=16000*16000;
    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;
}