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#include <bits/stdc++.h>
using namespace std;
ifstream ci("transport.in");
ofstream cou("transport.out");
int n,k,st=1,dr=16000,mij,v[16000];
int verif (int cap)
{
int nrtrans=1,cap1=cap,i;
for(i=1; i<=n; i++)
{
cap-=v[i];
if(cap<0)
{
cap=cap1;
nrtrans++;
}
}
return nrtrans;
}
int cautarebin()
{
int p;
while(st<=dr)
{
mij=(st+dr)/2;
p=verif(mij);
if(p<k )
{
dr=mij;
}
else
{
if(p>k)
{
st=mij;
}else{
if(p==k){
return mij;
}
}
}
}
}
int main()
{
int i,x;
ci>>n>>k;
for(i=1; i<=n; i++)
{
ci>>v[i];
}
x=cautarebin();
cout<<x;
}