#include<cstdio>
int n,k,i,a[16010],left,right,middle,s,p,sol;
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d %d",&n,&k);
    left=16001;
    for(i=1;i<=n;i++)
    {
        scanf("%d",&a[i]);
        if(a[i]<left) left=a[i];
        right+=a[i];
    }
    while(left<=right)
    {
        s=0; p=1;
        middle=(left+right)/2;
        for(i=1;i<=n;i++)
        {
            if(s+a[i]<middle) {s+=a[i];}
            else if(s+a[i]==middle) {s=0; p++;}
            else {p++; s=a[i];}
        }
        if(!s) p--;
        if(p<=k)
        {
            sol=middle;
            right=middle-1;
        }
        else
        {
            left=middle+1;
        }
    }
    printf("%d\n",sol);
    return 0;
}