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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,i,a[16001],k,st=0,dr=265000000,cant,mij,drum;
int main()
{
f>>n;
f>>k;
for(i=1;i<=n;i++)
{
f>>a[i];
if(a[i]>st)
st=a[i];
}
while(st<dr)
{
cant=0;
drum=1;
mij=(st+dr)/2;
for(i=1;i<=n;i++)
{
if(cant+a[i]<=mij)
cant=cant+a[i];
else
{
cant=a[i];
drum++;
}
}
if(drum>k)
st=mij+1;
else
dr=mij-1;
}
g<<mij;
f.close();
g.close();
return 0;
}