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#include <bits/stdc++.h>
#include <stdio.h>
using namespace std;
int v[16000];
ifstream in("transport.in");
ofstream out("transport.out");
int main()
{
int n, k, cnt=0, sum=0, ;
long long minim=210000000;
in >> n >> k;
for(int i=0; i<n; i++)
{
in >> v[i];
}
int st=1, dr=256000000, mj;
while(st!=dr)
{
sum=0;
mj=(st+dr)/2;
for(int i=0; i<n; i++)
{
sum=sum+v[i];
if(sum>mj)
{
cnt++;
sum=v[i];
}
}
if(cnt<=k)
{
dr=mj;
if(minim>mj)
{
minim=mj;
}
}
else
{
st=mj+1;
}
}
out << minim;
return 0;
}