#include<cstdio>
FILE *in,*out;
int v[16001];
int main(){
    in=fopen("transport.in","r");
    out= fopen("transport.out","w");
    int elem,m,n,k,i,c,l1=0,l2=0,s,nrt;;
    fscanf(in,"%d%d",&n,&k);
    for(i=1;i<=n;i++){
        fscanf(in,"%d",&v[i]);
        l2=l2+v[i];
        if(v[i]>l1)
            l1=v[i];
    }
    while(l2>=l1){
        c=(l1+l2)/2;
        nrt=1;
        s=0;
        for(i=1;i<=n;i++)
            if(s+v[i]<=c)
                s=s+v[i];
            else{
                nrt++;
                s=v[i];
            }
        if(nrt<=k){
            elem=c;
            l2=c-1;
        }
        else
            l1=c+1;
    }
    fprintf(out,"%d",elem);
    return 0;
}