#include <fstream>
using namespace std;
fstream f("transport.in",ios::in);
fstream g("transport.out",ios::out);
long long n,k,k1,i,v[20000],min1,t,u,p,m,nr,max1,s;
int main()
{
    f>>n>>k;
for(i=1;i<=n;i++){
 f>>v[i];
k1=k1+v[i];
if(v[i]>max1){max1=v[i];}
}
u=max1; p=k1;
min1=16001;
while(u<=p){
m=(u+p)/2;    nr=0;
for(i=1;i<=n; )
{
s=0;
while(s+v[i]<=m&&i<=n){
s+=v[i];i++;
}
nr++;
}
if(nr>k){u=m+1;}
else{
if(nr<=k){
min1=m;p=m-1;
} } }
g<<min1;
return 0;
}