#include<stdio.h>
#define N 16001
long a[N],n,i,k,s[N],x,c,l,t,y,m;
int main()
{freopen("transport.in","r",stdin);
freopen("transport.out","w",stdout);
scanf("%ld%ld",&n,&k);
for(i=1;i<=n;i++)
       {scanf("%ld",&a[i]),s[i]=s[i-1]+a[i];
       if(m<a[i])
                m=a[i];}
c=m+1;
while(1)
       {for(i=1,t=x=0;i<=n;i++)
       if(s[i]-s[t]>c)
               t=i-2,x++;
       if(x==k)
               y=1;
       if(!y)
               if(x<k)
                      c--;
               else
                      c++;
       else
               {if(x!=k)
                      break;
               c--;}}
printf("%ld",c+1);
return 0;}