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#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, k, v[16001];
bool verificare(int a){
int vol=0; int nrt=1;
for(int i = 1;i<=n;i++){
if(vol+v[i]<=a){
vol+=v[i];
} else if(v[i]>a)
return false;
else{
vol=v[i];
nrt++;
}
}
if(nrt<=k){
return true;
}
else
return false;
}
int caut(){
int s=1, d=0, mid, min=0;
for(int i = 1;i<=n;i++){
d+=v[i];
}
while(s<=d){
mid=(s+d)/2;
if(verificare(mid)){
min=mid;
d-=1;
}
else
s+=1;
}
return min;
}
int main(){
fin >> n >> k;
for(int i = 1;i<=n;i++){
fin >> v[i];
}
fout << caut();
}