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#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k;
int v[16001];
bool transport(int x)
{
int suma=0;
int t=0;
for(int i=1; i<=n; i++)
{
if(suma+v[i]<=x)
{
suma+=v[i];
}
else
{
suma=v[i];
t++;
if(t>k)
{
return 0;
}
}
}
if(t+1>k)
{
return 0;
}
else
{
return 1;
}
}
int main()
{
fin>>n>>k;
int maxim=0;
for(int i=1; i<=n; i++)
{
fin>>v[i];
maxim=max(maxim,v[i]);
}
int st=maxim,dr=16000*16000;
int sol=0;
while(st<=dr)
{
int m=(st+dr)/2;
if(transport(m)==0)
{
st=m+1;
}
else
{
sol=m;
dr=m-1;
}
}
fout << sol;
}