#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n, i, v[16010], p, u, m, k, sol;

int calculeaza(int x){
    int nr=0, s=0, nrt=0;
    for(i=1; i<=n; i++)
    {
        s+=v[i];
        if(s>x)
            nr=1, s=v[i], nrt++;
        else
            nr++;
    }
    if(s>0)
        nrt++;
    return nrt;
}

int main(){
    f>>n>>k;
    for(i=1; i<=n; i++)
        f>>v[i];
    p=1;
    u=(1<<30);
    while(p<=u)
    {
        m=(p+u)>>1;
        if(calculeaza(m)<=k)
        {
            sol=m;
            u=m-1;
        }
        else
            p=m+1;
    }
    g<<sol<<"\n";
    return 0;
}