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#include <bits/stdc++.h>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int n,k;
int v[16001];
bool ok(int c)
{
int cc=0,nr=0;
for(int i=0;i<n;++i)
{
if(v[i]>c)
return false;
if(v[i]>cc)
{
nr++;
cc=c;
}
cc-=v[i];
}
return (nr<=k);
}
int main()
{
int pas=1<<30;
int r=0;
in>>n>>k;
for(int i=0;i<n;++i)
in>>v[i];
while(pas>0)
{
if(!ok(r+pas))
r+=pas;
pas/=2;
}
out<<r+1;
return 0;
}