#include<cstdio>
using namespace std;
long long v[17000];
int main(){
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    long long n,k,i,s=0,l1,l2,m,nr,c,elem;
    scanf("%lld%lld",&n,&k);
    for(i=1;i<=n;i++){
        scanf("%lld",&v[i]);
        s+=v[i];
    }
    l1=1;
    l2=s;
    while(l1<=l2){
        m=(l1+l2)/2;
        nr=1;
        c=0;
        for(i=1;i<=n;i++){
            c+=v[i];
            if(c>m){
                c=v[i];
                nr++;
            }
        }
        if(nr>k)
            l1=m+1;
        else{
            l2=m-1;
            elem=m;
        }
    }
    printf("%lld",elem);
    return 0;
}