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#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, m, v[1005];
bool ok(int x)
{
int suma=0, contor=0;
for(int i=1; i<=n; i++)
{
if(suma+v[i]<=x)
{
suma+=v[i];
}
else
{
suma=v[i];
contor++;
}
}
return (contor<m);
}
int main()
{
int st=1, dr, mij, s=0, maxim=0;
fin>>n>>m;
for(int i=1; i<=n; i++)
{
fin>>v[i];
s+=v[i];
if(v[i]>maxim)
{
maxim=v[i];
}
}
st=maxim;
dr=s;
while(st<=dr)
{
mij=(st+dr)/2;
if(ok(mij))
{
dr=mij-1;
}
else
{
st=mij+1;
}
}
fout<<st;
return 0;
}