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#include <iostream>
#include <fstream>
#define N 16005
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int n, k, v[N];
bool tr(int x){
int c=0, t=0;
for(int i=1; i<=n; i++){
if(c+v[i]>x)c=0,t++;
c+=v[i];
}
if(c<=x)t++;
return (t<=k);
}
int bs(int l, int r){
int m;
l--, r++;
while(r-l>1){
m=(l+r)>>1;
if(tr(m)){
r=m;
}else{
l=m;
}
}
return r;
}
int main(){
in>>n>>k;
int s=0, mn=16001;
for(int i=1; i<=n; i++){
in>>v[i];
s+=v[i];
mn=min(mn, v[i]);
}
out<<bs(mn, s);
return 0;
}