#include <cstdio>

using namespace std;
int v[16005];
bool  BUN( int x, int n, int k)
{
    int nrt = 0, i = 1, s = 0;
    while( nrt < k && i <= n)
    {
        s = 0;
        if(v[i] > x) return false;

        while( s + v[i] <= x && i <= n ){
            s += v[i], i++;
        }
        nrt++;
    }
    if( i == n + 1 )
        return true;
    else return false;
}
int CAUTBIN(int n, int k)
{
    int pow = 1 << 16, rez = 0;
    while( pow > 0 )
    {
        if( BUN(rez + pow, n, k) == false)
            rez += pow;
        pow >>= 1;
    }
    return rez + 1;
}

int main()
{
    freopen("transport.in", "r", stdin);
    freopen("transport.out", "w", stdout);
    int n, k;
    scanf("%d%d", &n, &k);
    for( int i = 1; i <= n; i++ )
    {
        scanf("%d", &v[i]);
    }
    printf("%d\n", CAUTBIN(n, k));
    return 0;
}