#include <fstream>
#include<iostream>
#include<vector>
using namespace std;
#define eps 1e-6
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,m;
vector<double> v;
int calc(int x){
    int y=0,p=1;
    for(int i=0;i<n;i++)
    {
        y+=v[i];
        if(y>x)
        {
            p++;
            y=v[i];
        }
    }
    if(p<=k) return 1;
    return 0;
}
int caut(int a, int b){
    while(a<=b)
    {
        int c=(b+a)/2;
        if(calc(c)==0) a=c+1;
        else b=c-1;
    }
    return b+1;
}
int main()
{
    f>>n>>k;
    for(int i=0;i<n;i++)
    {
        int x;
        f>>x,v.push_back(x);
        if(x>m) m=x;
    }
    g<<caut(m,1000000000);
    return 0;
}